PlaylistManager: Only search for folders, don't try it with webstreams.

/_mapping.txt, /player.json, /playlist_manager.json, /controller.json and /position.json to get the matching data as well as /cmd to send commands to.

.gitignore

@@ -1,3 +1,5 @@
 .pio
 .pioenvs
 .piolibdeps
+.vscode
+include/config.h

README.md

@@ -0,0 +1,147 @@
+# ESMP3
+
+## What you need
+Please note: This list is a "things I used", neither
+"these are the best things for this stuff" nor "you
+can only use these things". But please be aware that
+using other stuff may lead to you having to make
+more or less easy modifications.
+
+Prizes are more or less the cheapest I could find on
+Aliexpress.
+
+| What? | For what? | Price (approx) |
+|-------|-----------|----------------|
+| ESP-32-WROOM-32D | Controlling everything |   4€ |
+| WS1053B on a PCB with SD card slot | Play the MP3 files; provide an SD card slot |   5€ |
+| MFRC522 | RFID reader |   1€ |
+| 5V Amplifier(s) (e.g. 2x PAM-8302) | Single-channel Amplifier |   2€ |
+| Speaker(s) matching your amp (e.g. 2pcs 4 Ohm 5W) | Enabling you to hear the sounds |   4€ |
+| RFID tags (ISO14443A) - e.g. 10 cards | You can also get Keyfobs or stickers |   4€ |
+| 4 buttons | Prev/Next track, Volume up/down |   1€ |
+
+You'all also need an SD card, some breadboard(s), jumper cables and a soldering iron.
+Also, some kind of box for the finished player.
+
+## How to connect
+
+Schematics coming soon...ish...
+
+## How to install
+
+Format your SD card with FAT32 and put files on it: Every album has
+to go into its own folder in the root of the SD card. Folders and files
+should not contain special characters (meaning stuff like äöüß). Spaces
+and dashes an alike are okay. Put the SD card into the SD card slot.
+
+Copy `include/config.sample.h` to `include/config.h`. Modify it to at
+least contain the correct login details for your WiFi.
+
+The code then should compile in PlatformIO without errors. Upload it
+to your ESP32. After that, upload static files using PlatformIO's task
+"Upload file system image".
+
+The serial console in PlatformIO should give you more or less useful
+messages about what's going on. There will also be a line saying
+"WiFi connected. IP address: xxx.xxx.xxx.xxx" when the connection to
+your WiFi succeeded.
+
+In your browser, enter "http://xxx.xxx.xxx.xxx/" (using the IP address)
+from above. From there you can define mappings between RFID tag IDs and
+folders on the SD card.
+
+## RFID-folder-mappings
+
+### Via webinterface
+
+To create a new mapping between an RFID tag and an folder, you can use
+the web interface. Click the button with the cogs icon. After putting
+your rfid tag on the reader (and possibly removing it again), its ID
+will be shown in the dialog. Click the button with the arrows behind
+the ID to start the mapping mode.
+
+The dialog showing all folders with media files will be shown. Click the
+button with the arrows behind the correct folder, to create the mapping.
+
+### Manually
+
+Mapping are stored on the SD card in the file `/_mapping.txt`. Every
+mapping goes on its own line. Lines should be separated by \n (Unix-
+style line endings); the last line should also end with a newline.
+
+Format of a line is `<RFID id>=<folder>`. RFID id is the UID of an
+RFID tag, expressed as 8 lowercase characters with leading 0 (if
+necessary). Folder is the foldername to play; starting with a slash and
+ending without one.
+
+A valid `_mapping.txt` could look like this:
+
+```
+1a2b3c4d=/Christmas Music Vol. 17
+003aab7f=/Let it go
+b691a22c=/Frozen Audiobook
+22cb6ae9=/Let it go
+
+```
+
+(Yes, more than one tag can map to a folder.)
+
+## Technical details
+
+### Ports
+
+| Device | Port | Connected to |
+| ------ | ---- | ------------ |
+| VS1053 | CS | 16 |
+| VS1053 | MISO | 19 |
+| VS1053 | MOSI | 23 |
+| VS1053 | SCK | 18 |
+| VS1053 | XCS | 4 |
+| VS1053 | XRESET | 0 |
+| VS1053 | XDCS | 2 |
+| VS1053 | DREQ | 15 |
+| RC522 | SDA | 17 |
+| RC522 | SCK | 18 |
+| RC522 | MOSI | 23 |
+| RC522 | MISO | 19 |
+| AMP_L | SD | 27 |
+| AMP_R | SD | 26 |
+| BTN_PREV | | 22 |
+| BTN_NEXT | | 33 |
+| BTN_VOL_UP | | 21 |
+| BTN_VOL_DOWN | | 32 |
+
+Buttons pull to GND if pushed -> Internal Pull-Up needed!
+
+### RFID tags
+The mapping of rfid tags to files uses the ID of the
+tag. A file called `_mapping.txt` in the root folder of
+the SD card defines the mappings between RFID tag ids and
+folders to play.
+
+The easiest way to create this file is to use the mapping
+functionality of the webinterface.
+
+#### Special modes
+You can also save data on the tags to further manipulate
+the system. Position of the data is irrelevant, the whole
+tag will be searched.
+
+Using `[random]` will play the files in a random order.
+`[random:2]` will randomize everything except the first 2
+files. This can be useful for having the favorite song of
+your kids playing, but after that getting a bit of randomness.
+
+Using `[lock]` will turn this key into a key for the locking
+mode. Scanning the tag enables locking mode. The next album
+started will keep running until the end. Removing the tag
+will be deactivated, as are the buttons for prev and next
+track. You can disable locking mode by again scanning the
+lock tag again.
+
+`[advent]` is used for christmas time. An album with this tag
+will only play in December. On December 1st, only track 1
+will play. On December 2nd, track 2 followed by track 1. On
+December 3rd, tracks 3, 1 and 2. From December 24th on, track
+24 followed by tracks 1-23. So your kid will get the "daily track"
+first, followed by all previous tags in the right order.

build_version.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+echo -n "-DVERSION=\\\"`git describe --tags --dirty`\\\""

data/index.html

@@ -0,0 +1,322 @@
+<!DOCTYPE html>
+<html>
+<head>
+	<meta charset="utf-8">
+	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+	<title>ESMP3</title>
+	<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha256-pasqAKBDmFT4eHoN2ndd6lN370kFiGUFyTiUHWhU7k8=" crossorigin="anonymous"></script>
+	<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
+	<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
+	<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
+	<script src="https://kit.fontawesome.com/272149490a.js" crossorigin="anonymous"></script>
+</head>
+
+<body>
+	<div class="container bg-dark text-light">
+		<div class="row">
+			<div class="col-sm-1">
+				<h1 id="play_state_icon"><i class="fa fa-stop"></i></h1>
+			</div>
+			<div class="col-sm-11">
+				<h2><i class="fa fa-compact-disc"></i> <span id="album"></span></h2>
+				<h2><i class="fa fa-scroll"></i> <span id="track"></span></h2>
+			</div>
+		</div>
+	</div>
+	<div class="container">
+		<div class="row">
+			<div class="col">
+				<input type="range" class="custom-range" id="position_slider" disabled>
+			</div>
+		</div>
+		<div class="row">
+			<div class="col-sm-6">
+			</div>
+			<div class="col-sm-1">
+				<h3><i class="fa fa-volume-down"></i></h3>
+			</div>
+			<div class="col-sm-4">
+				<input type="range" class="custom-range" id="volume_slider">
+			</div>
+			<div class="col-sm-1">
+				<h3><i class="fa fa-volume-up"></i></h3>
+			</div>
+		</div>
+		<div class="row">
+			<div class="col">
+				<button type="button" class="btn btn-primary btn-lg btn-block" id="button_track_prev"><i class="fa fa-step-backward"></i></button>
+			</div>
+			<div class="col">
+				<button type="button" class="btn btn-primary btn-lg btn-block" id="button_stop"><i class="fa fa-stop"></i></button>
+			</div>
+			<div class="col">
+				<button type="button" class="btn btn-primary btn-lg btn-block" id="button_play"><i class="fa fa-play"></i></button>
+			</div>
+			<div class="col">
+				<button type="button" class="btn btn-primary btn-lg btn-block" id="button_track_next"><i class="fa fa-step-forward"></i></button>
+			</div>
+			<div class="col">
+				<button type="button" class="btn btn-primary btn-lg btn-block" id="button_lock"><i class="fa fa-lock-open"></i></button>
+			</div>
+			<div class="col">
+				<button type="button" class="btn btn-primary btn-lg btn-block" id="button_open"><i class="fa fa-eject"></i></button>
+			</div>
+			<div class="col">
+				<button type="button" class="btn btn-primary btn-lg btn-block" id="button_settings"><i class="fa fa-cog"></i></button>
+			</div>
+		</div>
+	</div>
+	
+	<div class="container">
+		<table class="table table-hover table-sm" id="track_list_table">
+			<thead class="thead-light">
+				<tr>
+					<th>Nr.</th>
+					<th>Status</th>
+					<th>Track</th>
+				</tr>
+			</thead>
+			<tbody class="" id="track_list">
+			
+			</tbody>
+		</table>
+	</div>
+	
+	
+	
+	<div class="modal fade" id="openModal" tabindex="-1" role="dialog">
+		<div class="modal-dialog modal-dialog-centered modal-dialog-scrollable" role="document">
+			<div class="modal-content">
+				<div class="modal-header">
+					<h5 class="modal-title">Album öffnen</h5>
+					<button type="button" class="close" data-dismiss="modal">
+						<span>&times;</span>
+					</button>
+				</div>
+
+				<h6>Open URL</h6>
+				<div class="input-group">
+					<div class="input-group-prepend">
+						<span class="input-group-text">
+							<i class="fa fa-link"></i>
+						</span>
+					</div>
+					<input type="text" class="form-control" id="input_url" />
+					<div class="input-group-append">
+						<button class="btn btn-primary" id="button_url_open">Go</button>
+						<button class="btn btn-danger" id="button_url_add_mapping" style="display: none;"><i class="fa fa-arrows-alt-h"></i></button>
+					</div>
+				</div>
+				
+				<div class="modal-body">
+					<div id="albums_without_id_area">
+						<h6>Albums without RFID card</h6>
+						<table class="table table-hover table-sm">
+							<tbody id="albums_without_id">
+							</tbody>
+						</table>
+					</div>
+					
+					<h6>Albums with RFID</h6>
+					<table class="table table-hover table-sm">
+						<tbody id="albums_with_id">
+						</tbody>
+					</table>
+				</div>
+				
+				<div class="modal-footer">
+					<button type="button" class="btn btn-primary" data-dismiss="modal">Close</button>
+				</div>
+			</div>
+		</div>
+	</div>
+
+	<div class="modal fade" id="settingsModal" tabindex="-1" role="dialog">
+			<div class="modal-dialog modal-dialog-centered modal-dialog-scrollable" role="document">
+				<div class="modal-content">
+					<div class="modal-header">
+						<h5 class="modal-title">Settings</h5>
+						<button type="button" class="close" data-dismiss="modal">
+							<span>&times;</span>
+						</button>
+					</div>
+					
+					<div class="modal-body">
+						<h6>Last RFID id:</h6>
+						<span id="last_rfid_id"></span> <button class="btn btn-warning" id="button_add_mapping"><i class="fa fa-arrows-alt-h"></i></button>
+						
+						<h6>Last RFID data:</h6>
+						<span id="last_rfid_data"></span>
+
+						<h6>Actions</h6>
+						<button type="button" class="btn btn-danger btn-lg btn-block" id="button_reset_vs1053">Reset VS1053 chip</button>
+						<button type="button" class="btn btn-danger btn-lg btn-block" id="button_reboot">Reboot ESMP3</button>
+					</div>
+					
+					<div class="modal-footer">
+						<button type="button" class="btn btn-primary" data-dismiss="modal">Close</button>
+					</div>
+				</div>
+			</div>
+		</div>
+</body>
+
+<script>
+update_player = function(data) {
+	$('#play_state_icon i').removeClass('fa-stop', 'fa-play').addClass(data.playing ? 'fa-play' : 'fa-stop');
+	
+	if (data.playing) {
+		$('#button_play').removeClass('btn-primary').addClass('btn-secondary', 'btn-disabled');
+		$('#button_stop').removeClass('btn-secondary', 'btn-disabled').addClass('btn-primary');
+	} else if (data.playlist) {
+		$('#button_play').removeClass('btn-secondary', 'btn-disabled').addClass('btn-primary');
+		$('#button_stop').removeClass('btn-primary').addClass('btn-secondary', 'btn-disabled');
+	} else {
+		$('#button_play').removeClass('btn-primary').addClass('btn-secondary', 'btn-disabled');
+		$('#button_stop').removeClass('btn-primary').addClass('btn-secondary', 'btn-disabled');
+	}
+	
+	$('#volume_slider').attr('min', data.volume.min).attr('max', data.volume.max).val(data.volume.current);
+	
+	if (data.playlist) update_playlist(data.playlist);
+}
+
+update_playlist = function(data) {
+	$('#track_list tr').remove();
+	for (var i=0; i<data.files.length; i++) {
+		tr = $('<tr>').data('track', i);
+		tr.append($('<td>').html(i + 1));
+		tr.append($('<td>').html(data.current_track==i ? '<i class="fa fa-play"></i>' : ''));
+		tr.append($('<td>').html(data.files[i].substr(data.files[i].title)));
+		$('#track_list').append(tr);
+	}
+	
+	if (data.has_track_next) {
+		$('#button_track_next').removeClass('btn-secondary', 'btn-disabled').addClass('btn-primary');
+	} else {
+		$('#button_track_next').removeClass('btn-primary').addClass('btn-secondary', 'btn-disabled');
+	}
+	
+	if (data.has_track_prev) {
+		$('#button_track_prev').removeClass('btn-secondary', 'btn-disabled').addClass('btn-primary');
+	} else {
+		$('#button_track_prev').removeClass('btn-primary').addClass('btn-secondary', 'btn-disabled');
+	}
+	
+	$('#album').html(data.title);
+	var file = data.files[data.current_track];
+	if (file) {
+		$('#track').html(file.title); 
+	}
+}
+
+update_controller = function(data) {
+	if (data.lock_state == "locked") {
+		$('#button_lock').removeClass('btn-primary', 'btn-warning').addClass('btn-danger');
+		$('#button_lock i').removeClass('fa-lock-open').addClass('fa-lock');
+	} else if (data.lock_state == "locking") {
+		$('#button_lock').removeClass('btn-primary', 'btn-danger').addClass('btn-warning');
+		$('#button_lock i').removeClass('fa-lock-open').addClass('fa-lock');
+	} else {
+		$('#button_lock').removeClass('btn-danger', 'btn-warning').addClass('btn-primary');
+		$('#button_lock i').removeClass('fa-lock').addClass('fa-lock-open');
+	}
+
+	$('#button_add_mapping').toggle(data.last_rfid.uid.length>0);
+	$('#last_rfid_id').html(data.last_rfid.uid);
+	$('#last_rfid_data').html(data.last_rfid.data);
+}
+
+update_playlist_manager = function(data) {
+	if (data.unmapped.length > 0) {
+		$('#albums_without_id_area').show();
+		$('#albums_without_id tr').remove();
+		data.unmapped = data.unmapped.sort();
+		for (var i=0; i<data.unmapped.length; i++) {
+			var tr = $('<tr>').attr('data-folder', data.unmapped[i]);
+			tr.append($('<td>').html(data.unmapped[i].substr(1)));
+			tr.append($('<td>').append($('<button>').addClass('button btn-warning add_mapping_button').hide().append($('<i>').addClass('fa fa-arrows-alt-h'))));
+			$('#albums_without_id').append(tr);
+		}
+	} else {
+		$('#albums_without_id_area').hide();
+	}
+	
+	var folders = Object.keys(data.folders).sort();
+	for (var i in folders) {
+		var folder = folders[i];
+		var tr = $('<tr>').attr('data-folder', folder);
+		tr.append($('<td>').html(folder.substr(1)));
+		tr.append($('<td>').append($('<button>').addClass('button btn-danger add_mapping_button').hide().append($('<i>').addClass('fa fa-arrows-alt-h'))));
+		$('#albums_with_id').append(tr);
+	}
+}
+
+update_position = function(data) {
+	$('#position_slider').attr('max', data.file_size).val(data.position);
+}
+
+process_ws_message = function(event) {
+	var data = event.data.split("\n");;
+	for (var i=0; i<data.length; i++) {
+		var json = JSON.parse(data[i]);
+		console.log(json);
+		if (json === null) continue;
+		switch(json["_type"]) {
+			case "position": update_position(json); break;
+			case "player": update_player(json); break;
+			case "playlist_manager": update_playlist_manager(json); break;
+			case "controller": update_controller(json); break;
+		}	
+	}
+}
+
+var play_on_click = true;
+
+$(function() {
+	ws = new WebSocket("ws://" + location.host + "/ws");
+	ws.onmessage = process_ws_message;
+	
+	$('#volume_slider').change(function(e) { ws.send("volume=" + e.target.value); });
+	$('#button_play').click(function(e) { ws.send("play"); });
+	$('#button_stop').click(function(e) { ws.send("stop"); });
+	$('#button_track_next').click(function(e) { ws.send("track_next"); });
+	$('#button_track_prev').click(function(e) { ws.send("track_prev"); });
+	$('#button_open').click(function(e) { $('#openModal').modal('show'); });
+	$('#track_list').on('click', 'tr', function(e) { ws.send("track=" + $(e.target).parent().data('track')); });
+	$('#albums_without_id, #albums_with_id').on('click', 'tr', function(e) { if (play_on_click) {ws.send("play " + $(e.target).parents('tr').data('folder')); $('#openModal').modal('hide');} });
+	$('#button_settings').click(function(e) { $('#settingsModal').modal('show'); });
+	$('#button_reset_vs1053').click(function(e) { ws.send("reset_vs1053"); $('#settingsModal').modal('hide'); });
+	$('#button_reboot').click(function(e) { ws.send("reboot"); $('#settingsModal').modal('hide'); });
+	$('#button_url_open').click(function(e) { ws.send("play " + $('#input_url').val()); $('#openModal').modal('hide');});
+	$('#button_add_mapping').click(function(e) {
+		$('#settingsModal').modal('hide');
+		$('#openModal').modal('show');
+		$('.add_mapping_button').show();
+		$('#button_url_open').hide();
+		$('#button_url_add_mapping').show();
+		play_on_click = false;
+	});
+	$('#openModal').on('click', '.add_mapping_button', function(e) {
+		ws.send("add_mapping=" + $('#last_rfid_id').html() + "=" + $(e.target).parents('tr').data('folder'));
+		$('#openModal').modal('hide');
+		$('.add_mapping_button').hide();
+		$('#button_url_open').hide();
+		$('#button_url_add_mapping').show();
+		e.stopPropagation();
+		play_on_click=true;
+		return false;
+	});
+	$('#button_url_add_mapping').click(function(e) {
+		ws.send("add_mapping=" + $('#last_rfid_id').html() + "=" + $('#input_url').val());
+		$('#openModal').modal('hide');
+		$('.add_mapping_button').hide();
+		$('#button_url_open').hide();
+		$('#button_url_add_mapping').show();
+		e.stopPropagation();
+		play_on_click=true;
+		return false;
+	});
+});
+</script>
+</html>

include/config.sample.h

@@ -0,0 +1,76 @@
+#pragma once
+#include <Arduino.h>
+
+#define SHOW_DEBUG
+//#define SHOW_TRACE
+#define FTP_DEBUG
+#define DELAY_AFTER_DEBUG_AND_TRACE 0
+
+#define WIFI_SSID "---CHANGEME---"
+#define WIFI_PASS "---CHANGEME---"
+
+#define VS1053_SLEEP_DELAY 5000
+#define POSITION_SEND_INTERVAL 5000
+
+#define DEBOUNCE_MILLIS      200
+#define VOLUME_DEFAULT 230
+#define VOLUME_MIN 190
+#define VOLUME_MAX 255
+#define VOLUME_STEP 0x08
+
+#define RFID_SCAN_INTERVAL 100
+
+#define NUM_BUTTONS 4
+
+#define PIN_SD_CS(x) (digitalWrite(16,  x))
+#define PIN_SD_CS_SETUP() (pinMode(16, OUTPUT))
+
+#define PIN_VS1053_XCS(x) (digitalWrite(4, x))
+#define PIN_VS1053_XCS_SETUP() (pinMode(4, OUTPUT))
+
+#define PIN_VS1053_XRESET(x) (digitalWrite(0, x))
+#define PIN_VS1053_XRESET_SETUP() (pinMode(0, OUTPUT))
+
+#define PIN_VS1053_XDCS(x) (digitalWrite(2, x))
+#define PIN_VS1053_XDCS_SETUP() (pinMode(2, OUTPUT))
+
+#define PIN_VS1053_DREQ() (digitalRead(15))
+#define PIN_VS1053_DREQ_SETUP() (pinMode(15, INPUT))
+
+#define PIN_RC522_CS(x) (digitalWrite(17, x))
+#define PIN_RC522_CS_SETUP() (pinMode(17, OUTPUT))
+
+#define PIN_SPEAKER_L(x) (digitalWrite(27, x))
+#define PIN_SPEAKER_L_SETUP() (pinMode(27, OUTPUT))
+
+#define PIN_SPEAKER_R(x) (digitalWrite(26, x))
+#define PIN_SPEAKER_R_SETUP() (pinMode(26, OUTPUT))
+
+#define BTN_PREV() ( ! digitalRead(22))
+#define BTN_PREV_SETUP() (pinMode(22, INPUT_PULLUP))
+
+#define BTN_VOL_UP() ( ! digitalRead(21))
+#define BTN_VOL_UP_SETUP() (pinMode(21, INPUT_PULLUP))
+
+#define BTN_VOL_DOWN() ( ! digitalRead(32))
+#define BTN_VOL_DOWN_SETUP() (pinMode(32, INPUT_PULLUP))
+
+#define BTN_NEXT() ( ! digitalRead(33))
+#define BTN_NEXT_SETUP() (pinMode(33, INPUT_PULLUP))
+
+
+// Other definitions
+#define INFO(x, ...) Serial.printf(x, ##__VA_ARGS__)
+#define ERROR(x, ...) Serial.printf(x, ##__VA_ARGS__)
+
+#ifdef SHOW_DEBUG
+	#define DEBUG(x, ...) {Serial.printf(x, ##__VA_ARGS__); delay(DELAY_AFTER_DEBUG_AND_TRACE);}
+#else
+	#define DEBUG(x, ...) while(0) {}
+#endif
+
+#ifdef SHOW_TRACE
+	#define TRACE(x, ...) {Serial.printf(x, ##__VA_ARGS__); delay(DELAY_AFTER_DEBUG_AND_TRACE);}
+#else
+	#define TRACE(x, ...) while(0) {}
+#endif

include/controller.h

@@ -1,30 +1,57 @@
 #pragma once
 
 #include <Arduino.h>
+#include <ESPAsyncWebServer.h>
 #include "config.h"
+
+class Controller;
+
 #include "player.h"
+#include "playlist.h"
+#include "playlist_manager.h"
+#include "http_server.h"
 #include <MFRC522.h>
-#include <MCP23S17/MCP23S17.h>
+
+enum ControllerState { NORMAL, LOCKING, LOCKED };
 
 class Controller {
 private:
 	MFRC522* _rfid;
-	MCP* _mcp;
+	HTTPServer* _http_server;
+	ControllerState _state = NORMAL;
 	bool _rfid_enabled = true;
 	void _check_rfid();
 	void _check_serial();
 	void _check_buttons();
+	bool _debounce_button(uint8_t index);
 	uint32_t _get_rfid_card_uid();
-	uint32_t _last_rfid_card_uid = 0;
-	Player* _player;
+	String _read_rfid_data();
+	bool _rfid_present = false;
+	String _last_rfid_uid = "";
+	String _last_rfid_data = "";
+	
 	unsigned long _last_rfid_scan_at = 0;
+	unsigned long _last_position_info_at = 0;
 	String _serial_buffer = String();
-	void _execute_serial_command(String cmd);
+	String _cmd_queue = "";
 	void _execute_command_ls(String path);
+	void _execute_command_ids();
 	void _execute_command_help();
 	unsigned long _button_last_pressed_at[NUM_BUTTONS];
 	bool _check_button(uint8_t btn);
 public:
-	Controller(Player* p, MCP* m);
+	Controller(Player* p, PlaylistManager* pm);
+	PlaylistManager* pm;
+	Player* player;
+	void register_http_server(HTTPServer* h);
 	void loop();
+	void send_controller_status();
+	void send_player_status();
+	void send_playlist_manager_status();
+	void send_position();
+	void inform_new_client(AsyncWebSocketClient* client);
+	String json();
+	bool process_message(String m);
+	void queue_command(String cmd);
+	void update_playlist_manager();
 };

include/data_sources.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include <Arduino.h>
+#include <SD.h>
+#include "config.h"
+#include "http_client_wrapper.h"
+
+class DataSource {
+private:
+public:
+	DataSource() {};
+	virtual ~DataSource() {};
+	virtual size_t read(uint8_t* buf, size_t len) = 0;
+	virtual int read() = 0;
+	virtual size_t position() = 0;
+	virtual void seek(size_t position) = 0;
+	virtual size_t size() = 0;
+	virtual void close() = 0;
+	virtual void skip_id3_tag() {};
+	virtual bool usable() = 0;
+};
+
+class SDDataSource : public DataSource {
+private:
+	File _file;
+public:
+	SDDataSource(String file);
+	~SDDataSource();
+	size_t read(uint8_t* buf, size_t len);
+	int read();
+	size_t position();
+	void seek(size_t position);
+	size_t size();
+	void close();
+	void skip_id3_tag();
+	bool usable();
+};
+
+class HTTPSDataSource : public DataSource {
+private:
+	WiFiClient* _stream = NULL;
+	HTTPClientWrapper* _http = NULL;
+	uint32_t _position;
+public:
+	HTTPSDataSource(String url, uint32_t offset=0);
+	~HTTPSDataSource();
+	size_t read(uint8_t* buf, size_t len);
+	int read();
+	size_t position();
+	void seek(size_t position);
+	size_t size();
+	void close();
+	bool usable();
+};

include/http_client_wrapper.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <HTTPClient.h>
+#include "config.h"
+
+class HTTPClientWrapper {
+private:
+	HTTPClient* _http;
+	uint8_t* _buffer;
+	uint16_t _buffer_size;
+	uint16_t _buffer_length;
+	uint16_t _buffer_position;
+	uint32_t _chunk_length;
+	
+	bool _connected = false;
+	String _content_type;
+	uint32_t _length;
+	bool _request(String method, String url, uint32_t offset=0, uint8_t redirection_count=0);
+	WiFiClient* _stream;
+	bool _is_chunked;
+	void _read_next_chunk_header(bool first);
+	uint16_t _fill_buffer();
+	
+public:
+	HTTPClientWrapper();
+	~HTTPClientWrapper();
+	bool get(String url, uint32_t offset=0, uint8_t redirection_count=0);
+	bool head(String url, uint32_t offset=0, uint8_t redirection_count=0);
+	String getContentType();
+	String getString();
+	int read();
+	uint32_t read(uint8_t* dst, uint32_t len);
+	void close();
+	uint32_t getSize();
+	String readUntil(String sep);
+	String readLine();
+};

include/http_server.h

@@ -0,0 +1,29 @@
+#pragma once
+
+class HTTPServer;
+
+#include "player.h"
+#include "controller.h"
+#include <AsyncTCP.h>
+#include <ESPAsyncWebServer.h>
+
+class HTTPServer {
+private:
+	AsyncWebServer* _server;
+	
+	Player* _player;
+	Controller* _controller;
+	void _handle_upload(AsyncWebServerRequest* request, String filename, size_t index, uint8_t* data, size_t len, bool final);
+	uint16_t _chunk_length;
+	uint8_t* _chunk;
+	File _upload_file;
+	uint32_t _file_size;
+	uint32_t _file_size_done;
+	bool _need_header;
+	uint32_t _upload_position;
+	void _onEvent(AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len);
+	void _handle_index(AsyncWebServerRequest* req);
+public:
+	HTTPServer(Player* p, Controller* c);
+	AsyncWebSocket* ws;
+};

include/player.h

@@ -2,45 +2,52 @@
 #include "config.h"
 #include <SPI.h>
 #include <SD.h>
-#include <list>
-#include <map>
-#include <MCP23S17/MCP23S17.h>
+#include "spi_master.h"
+#include "playlist.h"
+#include "data_sources.h"
+
+class Player;
+
+#include "controller.h"
 
 #define SCI_MODE 0x00
 #define SCI_STATUS 0x01
+#define SCI_BASS 0x02
 #define SCI_CLOCKF 0x03
 #define SCI_DECODE_TIME 0x04
+#define SCI_AUDATA 0x05
 #define SCI_VOL 0x0B
 #define SCI_WRAMADDR 0x07
 #define SCI_WRAM 0x06
+#define SCI_HDAT0 0x08
+#define SCI_HDAT1 0x09
+#define SCI_AIADDR 0x0A
+#define SCI_AICTRL0 0x0C
+#define SCI_AICTRL1 0x0D
+#define SCI_AICTRL2 0x0E
+#define SCI_AICTRL3 0x0F
 
 #define CMD_WRITE 0x02
 #define CMD_READ 0x03
 
 #define ADDR_ENDBYTE 0x1E06
 
+#define SM_LAYER12 0x0001
+#define SM_RESET 0x0004
 #define SM_CANCEL 0x0008
+#define SM_SDINEW 0x0800
+#define SM_ADPCM 0x1000
 #define SS_DO_NOT_JUMP 0x8000
 
-#define XRESET PIN_VS1053_XRESET
-#define DREQ PIN_VS1053_DREQ
-#define XCS PIN_VS1053_XCS
-#define XDCS PIN_VS1053_XDCS
-
 class Player {
 private:
 	enum state { uninitialized, idle, playing, stopping,
-		system_sound_while_playing, system_sound_while_stopped };
-	struct album_state {
-		uint8_t index;
-		uint32_t position;
-	};
-	void _check_system_sound(String filename);
+		sleeping, recording };
 	void _reset();
-	void _init();
 	void _wait();
-	uint16_t _read_control_register(uint8_t address);
-	void _write_control_register(uint8_t address, uint16_t value);
+	uint16_t _read_control_register(uint8_t address, bool do_wait=true);
+	void _write_control_register(uint8_t address, uint16_t value, bool do_wait=true);
+	void _write_direct(uint8_t address, uint16_t value);
 	void _write_data(uint8_t* data);
 	uint16_t _read_wram(uint16_t address);
 	state _state = state::uninitialized;
@@ -49,44 +56,49 @@ private:
 	void _flush_and_cancel();
 	int8_t _get_endbyte();
 	void _flush(uint count, int8_t fill_byte);
-	void _set_last_track(const char* album, uint8_t track, uint32_t position);
-	std::map<String, album_state> _last_tracks;
 	void _play_file(String filename, uint32_t offset);
-	uint32_t _id3_tag_offset(File f);
 	void _finish_playing();
-	void _finish_stopping();
+	void _finish_stopping(bool turn_speaker_off);
 	void _mute();
 	void _unmute();
+	void _sleep();
+	void _wakeup();
+	void _record();
+	void _patch_adpcm();
+	void _speaker_off();
+	void _speaker_on();
 
 	SPISettings _spi_settings_slow = SPISettings(250000, MSBFIRST, SPI_MODE0);
 	SPISettings _spi_settings_fast = SPISettings(4000000, MSBFIRST, SPI_MODE0);
 	SPISettings* _spi_settings = &_spi_settings_slow;
 
-	std::list<String> _files_in_dir(String dir);
-	String _find_album_dir(String album);
-	File _file;
+	DataSource* _file;
+	uint32_t _file_size = 0;
 	uint8_t _buffer[32];
-	String _playing_album;
-	uint8_t _playing_index;
-	uint8_t _playing_album_songs;
-	uint32_t _current_play_position;
+	uint32_t _current_play_position = 0;
+	Playlist* _current_playlist = NULL;
 	uint _refills;
 	uint8_t _volume;
 	uint16_t _stop_delay;
 	uint32_t _skip_to;
-	MCP* _mcp;
+	SPIMaster* _spi;
+	Controller* _controller;
+	unsigned long _stopped_at;
 public:
-	Player(MCP* m);
+	Player(SPIMaster* s);
+	void init();
+	void register_controller(Controller* c);
 	void vol_up();
 	void vol_down();
 	void track_next();
 	void track_prev();
-
-	bool play_album(String album);
-	bool play_song(String album, uint8_t song_index, uint32_t offset=0);
-	void play_system_sound(String filename);
-	void stop();
+	void set_track(uint8_t track);
+	bool is_playing();
+	bool play();
+	bool play(Playlist* p);
+	void stop(bool turn_speaker_off=true);
 	bool loop();
 	void set_volume(uint8_t vol, bool save = true);
-	std::list<String> ls(String path);
+	String position_json();
+	String json();
 };

include/playlist.h

@@ -0,0 +1,47 @@
+#pragma once
+#include <Arduino.h>
+#include <vector>
+#include <ArduinoJson.h>
+#include "http_client_wrapper.h"
+
+struct PlaylistEntry {
+	String filename;
+	String title;
+	
+	bool operator<(PlaylistEntry p) { return title < p.title; }
+};
+
+class Playlist {
+private:
+	uint32_t _position = 0;
+	uint32_t _current_track = 0;
+	bool _started = false;
+	bool _shuffled = false;
+	std::vector<PlaylistEntry> _files;
+	String _title = "";
+	void _add_path(String path);
+	void _examine_http_url(String url);
+	void _parse_rss(HTTPClientWrapper* http);
+	void _parse_m3u(HTTPClientWrapper* http);
+	void _parse_pls(HTTPClientWrapper* http);
+public:
+	Playlist(String path);
+	void start();
+	uint16_t get_file_count();
+	bool has_track_next();
+	bool has_track_prev();
+	bool track_next();
+	bool track_prev();
+	void track_restart();
+	bool set_track(uint8_t track);
+	void reset();
+	bool is_empty();
+	String get_current_file();
+	uint32_t get_position();
+	void set_position(uint32_t p);
+	void shuffle(uint8_t random_offset=0);
+	void advent_shuffle(uint8_t day);
+	bool is_fresh();
+	void dump();
+	void json(JsonObject json);
+};

include/playlist_manager.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <map>
+#include <vector>
+#include "playlist.h"
+
+class PlaylistManager {
+private:
+	std::map<String, String> _map;
+	std::map<String, Playlist*> _playlists;
+	std::vector<String> _unmapped_folders;
+	void _check_for_special_chars(String s);
+	void _save_mapping();
+public:
+	PlaylistManager();
+	Playlist* get_playlist_for_id(String id);
+	Playlist* get_playlist_for_folder(String folder);
+	void dump_ids();
+	void scan_files();
+	String json();
+	bool add_mapping(String id, String folder);
+	String create_mapping_txt();
+};

include/spi_master.h

@@ -6,30 +6,65 @@
 
 class SPIMaster {
 public:
+	static uint8_t state;
+
 	static void init() {
-		SPI.setHwCs(false);
-		pinMode(PIN_SD_CS, OUTPUT);
-		pinMode(PIN_VS1053_XCS, OUTPUT);
-		pinMode(PIN_VS1053_XDCS, OUTPUT);
-		pinMode(PIN_MCP, OUTPUT);
-	}
-	static void enable(uint8_t pin) {
-		digitalWrite(PIN_SD_CS, pin==PIN_SD_CS ? LOW : HIGH);
-		digitalWrite(PIN_VS1053_XCS, pin==PIN_VS1053_XCS ? LOW : HIGH);
-		digitalWrite(PIN_VS1053_XDCS, pin==PIN_VS1053_XDCS ? LOW : HIGH);
-		digitalWrite(PIN_MCP, pin==PIN_MCP ? LOW : HIGH);
-
+		PIN_SD_CS_SETUP();
+		PIN_VS1053_XCS_SETUP();
+		PIN_VS1053_XDCS_SETUP();
+		PIN_RC522_CS_SETUP();
+		disable();
 	}
 
-	static void printStatus() {
-		Serial.printf("CS state: SD:%d, VS1053_XCS:%d, VS1053_XDCS:%d, MCP:%d\n",
-		digitalRead(PIN_SD_CS),
-		digitalRead(PIN_VS1053_XCS),
-		digitalRead(PIN_VS1053_XDCS),
-		digitalRead(PIN_MCP));
+	static void select_sd(bool enabled=true) {
+		PIN_SD_CS(enabled ? LOW : HIGH);
+		if (enabled) {
+			state |= 1;
+		} else {
+			state &= ~1;
+		}
+	}
+
+	static void select_vs1053_xcs(bool enabled=true) {
+		PIN_VS1053_XCS(enabled ? LOW : HIGH);
+		if (enabled) {
+			state |= 2;
+		} else {
+			state &= ~2;
+		}
+	}
+
+	static void select_vs1053_xdcs(bool enabled=true) {
+		PIN_VS1053_XDCS(enabled ? LOW : HIGH);
+		if (enabled) {
+			state |= 4;
+		} else {
+			state &= ~4;
+		}
+	}
+
+	static void select_rc522(bool enabled=true) {
+		PIN_RC522_CS(enabled ? LOW : HIGH);
+		if (enabled) {
+			state |= 8;
+		} else {
+			state &= ~8;
+		}
+	}
+
+	static void set_state(uint8_t s) {
+		disable();
+		if (s & 1) select_sd();
+		if (s & 2) select_vs1053_xcs();
+		if (s & 4) select_vs1053_xdcs();
+		if (s & 8) select_rc522();
 	}
 
 	static void disable() {
-		enable(142);
+		PIN_SD_CS(HIGH);
+		PIN_VS1053_XCS(HIGH);
+		PIN_VS1053_XDCS(HIGH);
+		PIN_RC522_CS(HIGH);
+		state = 0;
 	}
-};
+};

platformio.ini

@@ -8,11 +8,16 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
-[env:esp12e]
-platform = espressif8266
-board = esp12e
+[env:esp32]
+platform = espressif32
+board = esp-wrover-kit
 framework = arduino
 upload_speed = 512000
-lib_deps = 63
-    https://github.com/n0mjs710/MCP23S17.git
-upload_port = /dev/cu.wchusbserial1420
+build_flags=!./build_version.sh
+lib_deps = MFRC522
+	https://github.com/me-no-dev/ESPAsyncWebServer.git
+	ArduinoJSON
+	6691 ; TinyXML
+upload_port = /dev/cu.SLAB_USBtoUART
+monitor_speed = 74480
+;monitor_port = /dev/cu.wchusbserial1420

src/controller.cpp

@@ -1,41 +1,60 @@
 #include "controller.h"
 #include "spi_master.h"
+#include "config.h"
+#include "playlist.h"
+#include "http_server.h"
+#include <ArduinoJson.h>
 
-Controller::Controller(Player* p, MCP* m) {
-	_player = p;
-	_mcp = m;
-	_rfid = new MFRC522(PIN_RC522_CS, MFRC522::UNUSED_PIN);
+Controller::Controller(Player* p, PlaylistManager* playlist_manager) {
+	player = p;
+	pm = playlist_manager;
+	_rfid = new MFRC522(17, MFRC522::UNUSED_PIN);
+	
+	player->register_controller(this);
 
-	SPIMaster::enable(PIN_MCP);
-	_mcp->pinMode(1, INPUT); _mcp->pullupMode(1, HIGH);
-	_mcp->pinMode(2, INPUT); _mcp->pullupMode(2, HIGH);
-	_mcp->pinMode(3, INPUT); _mcp->pullupMode(3, HIGH);
-	_mcp->pinMode(4, INPUT); _mcp->pullupMode(4, HIGH);
+	BTN_NEXT_SETUP();
+	BTN_PREV_SETUP();
+	BTN_VOL_UP_SETUP();
+	BTN_VOL_DOWN_SETUP();
 
-	SPIMaster::enable(PIN_RC522_CS);
-	DEBUG("Initializing RC522...");
+	SPIMaster::select_rc522();
+	DEBUG("Initializing RC522...\n");
 	_rfid->PCD_Init();
 	#ifdef SHOW_DEBUG
 		_rfid->PCD_DumpVersionToSerial();
 	#endif
-	SPIMaster::disable();
+	SPIMaster::select_rc522(false);
 	INFO("RC522 initialized.\n");
 
 	for (uint8_t i=0; i<NUM_BUTTONS; i++) _button_last_pressed_at[i]=0;
 }
 
+void Controller::register_http_server(HTTPServer* h) {
+	_http_server = h;
+}
+
 void Controller::loop() {
+	TRACE("Controller::loop()...\n");
 	unsigned long now = millis();
 	if ((_last_rfid_scan_at < now - RFID_SCAN_INTERVAL) || (now < _last_rfid_scan_at)) {
 		_check_rfid();
 		_last_rfid_scan_at = now;
 	}
+	if ((_last_position_info_at < now - POSITION_SEND_INTERVAL) || (now < _last_position_info_at)) {
+		send_position();
+		_last_position_info_at = now;
+	}
 	_check_serial();
 	_check_buttons();
+	if (_cmd_queue.length() > 0) {
+		process_message(_cmd_queue);
+		_cmd_queue = "";
+	}
+	TRACE("Controller::loop() done.\n");
 }
 
 uint32_t Controller::_get_rfid_card_uid() {
-	SPIMaster::enable(PIN_RC522_CS);
+	SPIMaster::select_rc522();
 	if (!_rfid->PICC_ReadCardSerial()) {
 		if (!_rfid->PICC_IsNewCardPresent()) {
 			return 0;
@@ -44,33 +63,179 @@ uint32_t Controller::_get_rfid_card_uid() {
 			return 0;
 		}
 	}
+	SPIMaster::select_rc522(false);
 	uint32_t uid = _rfid->uid.uidByte[0]<<24 | _rfid->uid.uidByte[1]<<16 | _rfid->uid.uidByte[2]<<8 | _rfid->uid.uidByte[3];
-	SPIMaster::disable();
 	return uid;
 }
 
 void Controller::_check_rfid() {
-	uint32_t uid = _get_rfid_card_uid();
-	if (uid != _last_rfid_card_uid) {
-		if (uid > 0) {
-			INFO("New RFID card uid: %08x\n", uid);
-			String s_uid = String(uid, HEX);
-			_player->play_album(s_uid);
-		} else {
-			INFO("No more RFID card.");
-			_player->stop();
+	TRACE("check_rfid running...\n");
+	MFRC522::StatusCode status;
+	if (_rfid_present) {
+		byte buffer[2];
+		byte buffer_size = 2;
+		SPIMaster::select_rc522();
+		status = _rfid->PICC_WakeupA(buffer, &buffer_size);
+		if (status == MFRC522::STATUS_OK) {
+			// Card is still present.
+			_rfid->PICC_HaltA();
+			SPIMaster::select_rc522(false);
+			return;
+		}
+		SPIMaster::select_rc522(false);
+		// Card is now gone
+		_rfid_present = false;
+		INFO("No more RFID card.\n");
+		if (_state != LOCKED) {
+			player->stop();
+		}
+		send_controller_status();
+	} else {
+		uint32_t uid = _get_rfid_card_uid();
+		if (uid > 0) {
+			String temp = String(uid, HEX);
+			String s_uid = "";
+			for (int i=0; i<(8-temp.length()); i++) {
+				s_uid.concat("0");
+			}
+			s_uid.concat(temp);
+			INFO("New RFID card uid: %s\n", s_uid.c_str());
+			_last_rfid_uid = s_uid;
+			_rfid_present = true;
+			
+			String data = _read_rfid_data();
+			_last_rfid_data = data;
+
+			Playlist* pl = pm->get_playlist_for_id(s_uid);
+			if (data.indexOf("[lock]") != -1) {
+				if (_state == LOCKED) {
+					_state = NORMAL;
+					DEBUG("ControllerState is now UNLOCKED\n");
+				} else {
+					DEBUG("ControllerState is now LOCKING\n");
+					_state = LOCKING;
+				}
+			}
+			if (pl==NULL) {
+				INFO("Could not find album for id '%s'.\n", s_uid.c_str());
+				send_controller_status();
+				return;
+			}
+			int index;
+			if (data.indexOf("[advent]") != -1 && pl->is_fresh()) {
+				struct tm time;
+				getLocalTime(&time);
+				if (time.tm_mon == 11) { // tm_mon is "months since january", so 11 means december.
+					pl->advent_shuffle(time.tm_mday);
+				} else {
+					// TODO
+				}
+			} else if (data.indexOf("[random]") != -1 && pl->is_fresh()) {
+				pl->shuffle();
+			} else if ((index=data.indexOf("[random:")) != -1 && pl->is_fresh()) {
+				String temp = data.substring(index + 8);
+				index = temp.indexOf("]");
+				TRACE("temp: %s, temp.substring(0, %d): %s\n", temp.c_str(), index, temp.substring(0, index).c_str());
+				if (index>0) {
+					uint8_t random_offset = temp.substring(0, index).toInt();
+					pl->shuffle(random_offset);
+				}
+			}
+			
+			if (_state == LOCKED) {
+				DEBUG("ControllerState is LOCKED, ignoring card.\n");
+				return;
+			}
+			
+			if (_state == LOCKING) {
+				_state = LOCKED;
+				DEBUG("ControllerState is now LOCKED.\n");
+			}
+			
+			player->play(pl);
+			//send_playlist_manager_status();
+			send_controller_status();
 		}
-		_last_rfid_card_uid = uid;
 	}
 }
 
+String Controller::_read_rfid_data() {
+	TRACE("_read_rfid_data() running...\n");
+	static MFRC522::MIFARE_Key keys[8] = {
+		{{0xd3, 0xf7, 0xd3, 0xf7, 0xd3, 0xf7}}, // D3 F7 D3 F7 D3 F7
+		{{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}}, // FF FF FF FF FF FF = factory default
+		{{0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5}}, // A0 A1 A2 A3 A4 A5
+		{{0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5}}, // B0 B1 B2 B3 B4 B5
+		{{0x4d, 0x3a, 0x99, 0xc3, 0x51, 0xdd}}, // 4D 3A 99 C3 51 DD
+		{{0x1a, 0x98, 0x2c, 0x7e, 0x45, 0x9a}}, // 1A 98 2C 7E 45 9A
+		{{0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}}, // AA BB CC DD EE FF
+		{{0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}  // 00 00 00 00 00 00
+	};
+	SPIMaster::select_rc522();
+	DEBUG("Trying to read RFID data...\n");
+	
+	String data = "";
+	MFRC522::PICC_Type type = _rfid->PICC_GetType(_rfid->uid.sak);
+	
+	uint8_t sectors = 0;
+	switch(type) {
+		case MFRC522::PICC_TYPE_MIFARE_MINI: sectors = 5; break;
+		case MFRC522::PICC_TYPE_MIFARE_1K: sectors = 16; break;
+		case MFRC522::PICC_TYPE_MIFARE_4K: sectors = 40; break;
+		default: INFO("Unknown PICC type %s\n", String(MFRC522::PICC_GetTypeName(type)).c_str());
+	}
+	
+	int good_key_index = -1;
+	for (uint8_t sector=1; sector<sectors; sector++) {
+		uint8_t blocks = (sector < 32) ? 4 : 16;
+		uint8_t block_offset = (sector < 32) ? sector * 4 : 128 + (sector - 32) * 16;
+		
+		MFRC522::StatusCode status;
+
+		for (int i=0; i<8; i++) {
+			MFRC522::MIFARE_Key *k = &keys[i];
+			TRACE("Trying MIFARE key %02X %02X %02X %02X %02X %02X...\n", k->keyByte[0], k->keyByte[1], k->keyByte[2], k->keyByte[3], k->keyByte[4], k->keyByte[5]);
+			status = _rfid->PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block_offset, k, &_rfid->uid);
+			if (status == MFRC522::STATUS_OK) {
+				TRACE("Authentication succeeded with key #%d\n", i);
+				good_key_index = i;
+				break;
+			}
+		}
+		if (good_key_index == -1) {
+			TRACE("Could not find a valid MIFARE key.\n");
+		} else {		
+			for (uint8_t block=0; block<blocks-1; block++) {
+				byte buffer[18];
+				uint8_t byte_count = 18;
+				status = _rfid->MIFARE_Read(block_offset + block, buffer, &byte_count);
+				if (status != MFRC522::STATUS_OK) {
+					DEBUG("MIFARE_Read() failed: %s\n", String(_rfid->GetStatusCodeName(status)).c_str());
+					continue;
+				}
+				for (int i=0; i<16; i++) {
+					if (buffer[i]>=0x20 && buffer[i]<0x7F) data.concat((char)buffer[i]);
+				}
+			}
+		}
+	}
+	
+	_rfid->PICC_HaltA();
+	_rfid->PCD_StopCrypto1();
+	DEBUG("Data from RFID: %s\n", data.c_str());
+	SPIMaster::select_rc522(false);
+	return data;
+}
+
 void Controller::_check_serial() {
+	TRACE("check_serial running...\n");
+
 	if (Serial.available() > 0) {
 		char c = Serial.read();
 		Serial.printf("%c", c);
 		if (c==10 || c==13) {
 			if (_serial_buffer.length()>0) {
-				_execute_serial_command(_serial_buffer);
+				process_message(_serial_buffer);
 				_serial_buffer = String();
 			}
 		} else {
@@ -79,90 +244,176 @@ void Controller::_check_serial() {
 	}
 }
 
-void Controller::_execute_serial_command(String cmd) {
-	DEBUG("Executing command: %s", cmd.c_str());
+bool Controller::process_message(String cmd) {
+	DEBUG("Executing command: %s\n", cmd.c_str());
 
-	if (cmd.equals("ls")) {
-		_execute_command_ls("/");
-	} else if (cmd.startsWith("ls ")) {
-		_execute_command_ls(cmd.substring(3));
-	} else if (cmd.startsWith("play ")) {
-		_player->play_album(cmd.substring(5));
-	} else if (cmd.startsWith("sys ")) {
-		_player->play_system_sound(cmd.substring(4));
+	if (cmd.startsWith("play ")) {
+		Playlist* p = pm->get_playlist_for_folder(cmd.substring(5));
+		player->play(p);
+	//} else if (cmd.equals("ls")) {
+	//	_execute_command_ls("/");
+	//} else if (cmd.startsWith("ls ")) {
+	//	_execute_command_ls(cmd.substring(3));
+	} else if (cmd.equals("play")) {
+		player->play();
+	
 	} else if (cmd.equals("stop")) {
-		_player->stop();
+		player->stop();
 	} else if (cmd.equals("help")) {
 		_execute_command_help();
 	} else if (cmd.equals("-")) {
-		_player->vol_down();
+		player->vol_down();
 	} else if (cmd.equals("+")) {
-		_player->vol_up();
-	} else if (cmd.equals("p")) {
-		_player->track_prev();
-	} else if (cmd.equals("n")) {
-		_player->track_next();
+		player->vol_up();
+	} else if (cmd.startsWith("volume=")) {
+		uint8_t vol = cmd.substring(7).toInt();
+		player->set_volume(vol);
+	} else if (cmd.equals("track_prev")) {
+		player->track_prev();
+	} else if (cmd.equals("track_next")) {
+		player->track_next();
+	} else if (cmd.startsWith("track=")) {
+		uint8_t track = cmd.substring(6).toInt();
+		player->set_track(track);
+	} else if (cmd.equals("ids")) {
+		pm->dump_ids();
+	} else if (cmd.equals("reset_vs1053")) {
+		player->stop();
+		player->init();
+	} else if (cmd.equals("reboot")) {
+		ESP.restart();
+	} else if (cmd.startsWith("add_mapping=")) {
+		String rest = cmd.substring(12);
+		uint8_t idx = rest.indexOf('=');
+		String id = rest.substring(0, idx);
+		String folder = rest.substring(idx + 1);
+		pm->add_mapping(id, folder);
+		send_playlist_manager_status();
 	} else {
 		ERROR("Unknown command: %s\n", cmd.c_str());
+		return false;
 	}
-	return;
+	return true;
 }
 
 void Controller::_execute_command_ls(String path) {
 	INFO("Listing contents of %s:\n", path.c_str());
-	std::list<String> files = _player->ls(path);
-	for(std::list<String>::iterator it=files.begin(); it!=files.end(); it++) {
-		INFO("  %s\n", (*it).c_str());
-	}
+	// TODO
+	//std::list<String> files = player->ls(path);
+	//for(std::list<String>::iterator it=files.begin(); it!=files.end(); ++it) {
+	//	INFO("  %s\n", (*it).c_str());
+	//}
 }
 
 void Controller::_execute_command_help() {
 	INFO("Valid commands are:");
 	INFO("  help      - Displays this help\n");
-	INFO("  ls [dir]  - Lists the contents of [dir] or, if not given, of /\n");
+	//INFO("  ls [dir]  - Lists the contents of [dir] or, if not given, of /\n");
+	INFO("  ids       - Lists all known ID-to-folder mappings\n");
 	INFO("  play [id] - Plays the album with the given id\n");
-	INFO("  sys [file]- Plays the file as system sound\n");
 	INFO("  stop      - Stops playback\n");
 	INFO("  - / +     - Decrease or increase the volume\n");
 	INFO("  p / n     - Previous or next track\n");
 }
 
 void Controller::_check_buttons() {
-	SPIMaster::enable(PIN_MCP);
-	SPI.beginTransaction(SPISettings(250000, MSBFIRST, SPI_MODE0));
-	/*if (millis()%100==0) {
-		Serial.printf("Buttons: %d %d %d %d\n", _mcp->digitalRead(1), _mcp->digitalRead(2), _mcp->digitalRead(3), _mcp->digitalRead(4));
-	}*/
-	if (_check_button(0)) {
-		_player->track_prev();
-	} else if (_check_button(1)) {
-		_player->vol_up();
-	} else if (_check_button(2)) {
-		_player->vol_down();
-	} else if (_check_button(3)) {
-		_player->track_next();
+	TRACE("check_buttons running...\n");
+
+	if (BTN_PREV() && _debounce_button(0)) {
+		if (_state == NORMAL) {
+			player->track_prev();
+		} else {
+			DEBUG("Ignoring btn_prev because state is LOCKED.\n");
+		}
+	} else if (BTN_VOL_UP() && _debounce_button(1)) {
+		player->vol_up();
+	} else if (BTN_VOL_DOWN() && _debounce_button(2)) {
+		player->vol_down();
+	} else if (BTN_NEXT() && _debounce_button(3)) {
+		if (_state == NORMAL) {
+			player->track_next();
+		} else {
+			DEBUG("Ignoring btn_next because state is LOCKED.\n");
+		}
 	}
-	SPI.endTransaction();
-	SPIMaster::disable();
 }
 
-bool Controller::_check_button(uint8_t index) {
-	if (index >= NUM_BUTTONS) return false;
+bool Controller::_debounce_button(uint8_t index) {
 	bool ret = false;
-	uint8_t sum = 0;
-	while (1) {
-		sum = 0;
-		for (int i=0; i<8; i++) {
-			sum += _mcp->digitalRead(index + 1) == HIGH ? 1 : 0;
-		}
-		if (sum==0 || sum==8) break;
-	}
-	if (sum == 0) {
-		if (_button_last_pressed_at[index] + DEBOUNCE_MILLIS < millis()) {
-			DEBUG("Button %d pressed.\n", index);
-			ret = true;
-		}
-		_button_last_pressed_at[index] = millis();
+	if (_button_last_pressed_at[index] + DEBOUNCE_MILLIS < millis()) {
+		DEBUG("Button %d pressed.\n", index);
+		ret = true;
 	}
+	_button_last_pressed_at[index] = millis();
 	return ret;
 }
+
+String Controller::json() {
+	DynamicJsonDocument json(1024);
+	json["_type"] = "controller";
+	switch(_state) {
+		case LOCKED: json["state"] = "locked"; break;
+		case LOCKING: json["state"] = "locking"; break;
+		case NORMAL: json["state"] = "normal"; break;
+	}
+	json["is_rfid_present"] = _rfid_present;
+	JsonObject rfid = json.createNestedObject("last_rfid");
+	rfid["uid"] = _last_rfid_uid;
+	rfid["data"] = _last_rfid_data;
+	json["uptime"] = millis() / 1000;
+	json["free_heap"] = ESP.getFreeHeap();
+	return json.as<String>();
+}
+
+void Controller::send_player_status() {
+	TRACE("In send_player_status()...\n");
+
+	if (_http_server->ws->count() > 0) {
+		_http_server->ws->textAll(player->json());
+		_http_server->ws->textAll(player->position_json());
+	}
+}
+
+void Controller::send_playlist_manager_status() {
+	TRACE("In send_playlist_manager_status()...\n");
+	if (_http_server->ws->count() > 0) {
+		_http_server->ws->textAll(pm->json());
+	}
+}
+
+void Controller::send_position() {
+	TRACE("In send_position()...\n");
+	if (_http_server->ws->count() > 0) {
+		_http_server->ws->textAll(player->position_json());
+	}
+	_last_position_info_at = millis();
+}
+
+void Controller::send_controller_status() {
+	TRACE("In send_controller_status()...\n");
+	if (_http_server->ws->count() > 0) {
+		_http_server->ws->textAll(json());
+	}
+}
+
+void Controller::inform_new_client(AsyncWebSocketClient* client) {
+	String s;
+	s += pm->json();
+	s += '\n';
+	s += player->json();
+	s += '\n';
+	s += player->position_json();
+	s += '\n';
+	s += json();
+	client->text(s);
+}
+
+void Controller::queue_command(String s) {
+	DEBUG("Enqeueing command '%s'.\n", s.c_str());
+	_cmd_queue = s;
+}
+
+void Controller::update_playlist_manager() {
+	pm->scan_files();
+	send_playlist_manager_status();
+}

src/data_sources.cpp

@@ -0,0 +1,57 @@
+#include "data_sources.h"
+
+////////////// SDDataSource //////////////
+SDDataSource::SDDataSource(String file) { _file = SD.open(file, "r"); }
+SDDataSource::~SDDataSource() { if (_file) _file.close(); }
+size_t SDDataSource::read(uint8_t* buf, size_t len) { return _file.read(buf, len); }
+int SDDataSource::read() { return _file.read(); }
+size_t SDDataSource::position() { return _file.position(); }
+void SDDataSource::seek(size_t position) { _file.seek(position); }
+size_t SDDataSource::size() { return _file.size(); }
+void SDDataSource::close() { _file.close(); }
+bool SDDataSource::usable() { return _file; }
+
+void SDDataSource::skip_id3_tag() {
+	uint32_t original_position = _file.position();
+	uint32_t offset = 0;
+	if (_file.read()=='I' && _file.read()=='D' && _file.read()=='3') {
+		DEBUG("ID3 tag found\n");
+		// Skip ID3 tag version
+		_file.read(); _file.read();
+		byte tags = _file.read();
+		bool footer_present = tags & 0x10;
+		DEBUG("ID3 footer found: %d\n", footer_present);
+		for (byte i=0; i<4; i++) {
+			offset <<= 7;
+			offset |= (0x7F & _file.read());
+		}
+		offset += 10;
+		if (footer_present) offset += 10;
+		DEBUG("ID3 tag length is %d bytes.\n", offset);
+		_file.seek(offset);
+	} else {
+		DEBUG("No ID3 tag found\n");
+		_file.seek(original_position);
+	}
+}
+
+
+
+////////////// HTTPSDataSource //////////////
+HTTPSDataSource::HTTPSDataSource(String url, uint32_t offset) {
+	_http = new HTTPClientWrapper();
+	if (!_http->get(url, offset)) return;
+	_position = 0;
+}
+
+HTTPSDataSource::~HTTPSDataSource() {
+	_http->close();
+	delete _http;
+}
+bool HTTPSDataSource::usable() { return _http; }
+size_t HTTPSDataSource::read(uint8_t* buf, size_t len) { size_t result = _http->read(buf, len); _position += result; return result; }
+int HTTPSDataSource::read() { int b = _http->read(); if (b>=0) _position++; return b; }
+size_t HTTPSDataSource::position() { return _position; }
+void HTTPSDataSource::seek(size_t position) { return; /* TODO */ }
+size_t HTTPSDataSource::size() { return _http->getSize(); }
+void HTTPSDataSource::close() { _http->close(); }

src/http_client_wrapper.cpp

@@ -0,0 +1,210 @@
+#include "http_client_wrapper.h"
+#include <WiFiClientSecure.h>
+
+HTTPClientWrapper::HTTPClientWrapper() {
+	_buffer = new uint8_t[512];
+	_buffer_size = 512;
+}
+
+HTTPClientWrapper::~HTTPClientWrapper() {
+	if (_http) {
+		_http->end();
+		delete _http;
+	}
+	delete _buffer;
+}
+
+void HTTPClientWrapper::close() {
+	_http->end();
+	_connected = false;
+}
+
+bool HTTPClientWrapper::get(String url, uint32_t offset, uint8_t redirection_count) { return _request("GET", url, offset, redirection_count); }
+bool HTTPClientWrapper::head(String url, uint32_t offset, uint8_t redirection_count) { return _request("HEAD", url, offset, redirection_count); }
+
+bool HTTPClientWrapper::_request(String method, String url, uint32_t offset, uint8_t redirection_count) {
+	if (redirection_count>=5) return false;
+	
+	//if (_http) delete _http;
+	
+	DEBUG("%s %s\n", method.c_str(), url.c_str());
+	_http = new HTTPClient();
+	
+	
+	_http->setUserAgent("PodBox/0.1");
+	if (offset) {
+		String s = "bytes=";
+		s += offset;
+		s += "-";
+		_http->addHeader("Range: ", s);
+	}
+	
+	const char* headers[] = {"Location", "Content-Type", "Transfer-Encoding"};
+	_http->collectHeaders(headers, 3);
+	bool result;
+	/*if (url.startsWith("https:")) {
+		BearSSL::WiFiClientSecure* client = new BearSSL::WiFiClientSecure();
+		client->setInsecure();
+		result = _http->begin(*client, url);
+	} else {
+		result = _http->begin(url);
+	}*/
+	result = _http->begin(url);
+	TRACE("HTTP->begin result: %d\n", result);
+	if (!result) return false;
+	
+	int status = _http->sendRequest(method.c_str());
+	TRACE("HTTP Status code: %d\n", status);
+	if (status == HTTP_CODE_FOUND || status==HTTP_CODE_MOVED_PERMANENTLY || status==HTTP_CODE_TEMPORARY_REDIRECT) {
+		if (_http->hasHeader("Location")) {
+			url = _http->header("Location");
+			_http->end();
+			delete _http;
+			_http = NULL;
+			return _request(method, url, offset, redirection_count+1);
+		} else {
+			ERROR("Got redirection HTTP code, but no Location header.\n");
+			delete _http;
+			_http = NULL;
+			return false;
+		}
+	} else if (status != HTTP_CODE_OK) {
+		DEBUG("Unexpected HTTP return code %d. Cancelling.\n", status);
+		return false;
+	}
+	
+	_connected = true;
+	_length = _http->getSize() + offset;
+	if (_http->hasHeader("Content-Type")) {
+		_content_type = _http->header("Content-Type");
+	} else {
+		_content_type = "";
+	}
+	_is_chunked = (_http->hasHeader("Transfer-Encoding")) && (_http->header("Transfer-Encoding").indexOf("chunked")!=-1);
+	_stream = _http->getStreamPtr();
+	if (_is_chunked) {
+		_read_next_chunk_header(true);
+	}
+	return true;
+}
+
+void HTTPClientWrapper::_read_next_chunk_header(bool first) {
+	if (!_connected) {
+		_chunk_length = 0;
+		return;
+	}
+	
+	if (!first) {
+		// read() returns an error if no bytes is available right at this moment.
+		// So we wait until 2 bytes are available or the connection times out.
+		while (_stream->connected() && !_stream->available()) { delay(1); }
+		int c1 = _stream->read();
+		while (_stream->connected() && !_stream->available()) { delay(1); }
+		int c2 = _stream->read();
+		if (c1==-1 || c2==-1) {
+			ERROR("Connection timeout.\n");
+			DEBUG("_stream.connected() returns %d\n", _stream->connected());
+			_chunk_length = 0;
+			_connected = false;
+			return;
+		} else if (c1!='\r' || c2!='\n') {
+			ERROR("Invalid chunk border found. Found: 0x%02X 0x%02X\n", c1, c2);
+			_chunk_length = 0;
+			_connected = false;
+			return;
+		}
+	}
+	String chunk_header = _stream->readStringUntil('\n');
+	chunk_header.trim();
+	_chunk_length = strtol(chunk_header.c_str(), NULL, 16);
+	if (_chunk_length == 0) {
+		_connected = false;
+		TRACE("Empty chunk found -> EOF reached.\n");
+	} else {
+		TRACE("Chunk found. Length: %d\n", _chunk_length);
+	}
+}
+
+uint16_t HTTPClientWrapper::_fill_buffer() {
+	if (!_connected) {
+		_buffer_position = 0;
+		_buffer_length = 0;
+		return 0;
+	}
+	
+	uint16_t bytes_to_fill = _buffer_size;
+	uint16_t bytes_filled = 0;
+	while (bytes_to_fill > 0) {
+		uint16_t bytes_to_request = bytes_to_fill;
+		if (_is_chunked && _chunk_length < bytes_to_fill) bytes_to_request = _chunk_length;
+		TRACE("fill_buffer loop. _is_chunked: %d, _chunk_length: %d, _buffer_size: %d, bytes_filled: %d, bytes_to_fill: %d, bytes_to_request: %d", _is_chunked, _chunk_length, _buffer_size, bytes_filled, bytes_to_fill, bytes_to_request);
+		uint16_t result = _stream->readBytes(_buffer + bytes_filled, bytes_to_request);
+		TRACE(", result: %d\n", result);
+		bytes_filled += result;
+		bytes_to_fill -= result;
+		if (_is_chunked) {
+			_chunk_length -= result;
+			if (_chunk_length == 0) _read_next_chunk_header(false);
+		}
+		if (result == 0) {
+			_connected = false;
+			break;
+		}
+	}
+	_buffer_position = 0;
+	_buffer_length = bytes_filled;
+	TRACE("Buffer filled. _buffer_length: %d\n", _buffer_length);
+	return bytes_filled;
+}
+
+String HTTPClientWrapper::getContentType() {
+	return _content_type;
+}
+
+int HTTPClientWrapper::read() {
+	if (_buffer_position >= _buffer_length) _fill_buffer();
+	if (_buffer_position >= _buffer_length) return -1;
+	return _buffer[_buffer_position++];
+}
+
+uint32_t HTTPClientWrapper::read(uint8_t* dst, uint32_t len) {
+	TRACE("Reading %d bytes...\n", len);
+	uint32_t bytes_filled = 0;
+	while (1) {
+		if (_buffer_position >= _buffer_length) _fill_buffer();
+		if (_buffer_position >= _buffer_length) break;
+
+		uint32_t bytes_to_fill = len;
+		if (bytes_to_fill > _buffer_length - _buffer_position) bytes_to_fill = _buffer_length - _buffer_position;
+
+		TRACE("read_loop: _buffer_length=%d, _buffer_position=%d, len=%d, bytes_to_fill=%d\n", _buffer_length, _buffer_position, len, bytes_to_fill);
+		memcpy(dst + bytes_filled, _buffer + _buffer_position, bytes_to_fill);
+		_buffer_position += bytes_to_fill;
+		bytes_filled += bytes_to_fill;
+		len -= bytes_to_fill;
+		if (bytes_to_fill==0 || len==0) break;
+	}
+	return bytes_filled;
+}
+
+uint32_t HTTPClientWrapper::getSize() {return _length; }
+
+String HTTPClientWrapper::readUntil(String sep) {
+	String result = "";
+	while(true) {
+		int i = read();
+		if (i==-1) break;
+		char c = i;
+		if (sep.indexOf(c)!=-1) {
+			// separator
+			if (result.length()>0) break;
+		} else {
+			result.concat(c);
+		}
+	}
+	return result;
+}
+
+String HTTPClientWrapper::readLine() {
+	return readUntil("\n\r");
+}

src/http_server.cpp

@@ -0,0 +1,144 @@
+#include "http_server.h"
+#include "spi_master.h"
+#include <ESPmDNS.h>
+#include <SPIFFS.h>
+
+HTTPServer::HTTPServer(Player* p, Controller* c) {
+	_player = p;
+	_controller = c;
+	_server = new AsyncWebServer(80);
+	ws = new AsyncWebSocket("/ws");
+	_server->addHandler(ws);
+	ws->onEvent([&](AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len){this->_onEvent(server, client, type, arg, data, len);});
+	
+	_server->on("/", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(SPIFFS, "/index.html", "text/html");});
+	_server->on("/upload", HTTP_POST, [](AsyncWebServerRequest* req) {req->send(200); }, ([&](AsyncWebServerRequest *request, String filename, size_t index, uint8_t *data, size_t len, bool final){this->_handle_upload(request, filename, index, data, len, final);}));
+	_server->on("/_mapping.txt", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "text/plain", _controller->pm->create_mapping_txt());});
+	_server->on("/player.json", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "application/json", _controller->player->json());});
+	_server->on("/playlist_manager.json", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "application/json", _controller->pm->json());});
+	_server->on("/controller.json", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "application/json", _controller->json());});
+	_server->on("/position.json", HTTP_GET, [&](AsyncWebServerRequest* req) {req->send(200, "application/json", _controller->player->position_json());});
+	_server->on("/cmd", HTTP_POST, [&](AsyncWebServerRequest *req) {req->send(200); }, NULL, [&](AsyncWebServerRequest *request, uint8_t *data, size_t len, size_t index, size_t total) {_controller->queue_command((char*)data);});
+	_server->begin();
+	MDNS.addService("http", "tcp", 80);
+}
+
+void HTTPServer::_handle_upload(AsyncWebServerRequest* request, String filename, size_t index, uint8_t* data, size_t len, bool final) {
+	// https://www.gnu.org/software/tar/manual/html_node/Standard.html
+	// https://www.mkssoftware.com/docs/man4/tar.4.asp
+	
+	if (index == 0) { // Starting upload
+		_chunk = new uint8_t[512];
+		_chunk_length = 0;
+		_upload_position = 0;
+		_file_size = 0;
+		_file_size_done = 0;
+		_need_header = true;
+	}
+	
+	uint32_t upload_offset = 0;
+	while (upload_offset < len) {
+		// Load a chunk
+		if (_chunk_length < 512 && len > upload_offset) {
+			uint16_t needed = 512 - _chunk_length;
+			if (needed > len - upload_offset) needed = len - upload_offset;
+			memcpy(_chunk + _chunk_length, data + upload_offset, needed);
+			_chunk_length += needed;
+			upload_offset += needed;
+			_upload_position += needed;
+		
+			if (_chunk_length == 512) {
+				// Process chunk
+				DEBUG(".");
+				if (_need_header) {
+					if (_chunk[257]=='u'&&_chunk[258]=='s'&&_chunk[259]=='t'&&_chunk[260]=='a'&&_chunk[261]=='r') {
+						DEBUG("It is a valid header, starting at 0x%X!\n", _upload_position-512);
+						char filename[200];
+						strncpy(filename, (char*)_chunk, 100);
+						DEBUG("filename: %s\n", filename);
+						_file_size = 0;
+						_file_size_done = 0;
+						for (int i=0; i<11; i++) {
+							//Serial.print(_header_buffer[124 + i]);
+							_file_size = (_file_size<<3) + (_chunk[124 + i] - '0');
+						}
+						DEBUG("filesize: %d\n", _file_size);
+						uint8_t type = _chunk[156] - '0';
+						if (type==0) {
+							String path = "/";
+							path += filename;
+							DEBUG("Opening file %s\n", path.c_str());
+							uint8_t state = SPIMaster::state;
+							SPIMaster::disable();
+							SPIMaster::select_sd();
+							// Better safe than sorry. ;-)
+							_upload_file.close();
+							_upload_file = SD.open(path, "w");
+							SPIMaster::set_state(state);
+						} else if (type==5) {
+							String dirname = "/";
+							dirname += filename;
+							dirname.remove(dirname.length()-1);
+							uint8_t state = SPIMaster::state;
+							SPIMaster::disable();
+							SPIMaster::select_sd();
+							bool res = SD.mkdir(dirname);
+							SPIMaster::set_state(state);
+							DEBUG("Creating folder '%s' returned %d.\n", dirname.c_str(), res);
+						} else {
+							ERROR("Unknown file type %d\n", type);
+						}
+						_need_header = (type==5 || _file_size==0); // No chunks needed for directories.
+					} else {
+						bool byte_found = false;
+						for (int i=0; i<512; i++) byte_found = byte_found || _chunk[i]>0;
+						if (!byte_found) {
+							DEBUG("Empty chunk while looking for header -> ignoring.\n");
+						} else {
+							ERROR("Invalid tar header: %c %c %c %c %c. Looking at header start offset 0x%X.\n", _chunk[257], _chunk[258], _chunk[259], _chunk[260], _chunk[261], _upload_position-512);
+						}
+					}
+				} else {
+					uint32_t bytes_to_write = _file_size - _file_size_done;
+					if (bytes_to_write > 512) bytes_to_write=512;
+					uint8_t state = SPIMaster::state;
+					SPIMaster::disable();
+					SPIMaster::select_sd();
+					_upload_file.write(_chunk, bytes_to_write);
+					_file_size_done += bytes_to_write;
+					if (_file_size_done >= _file_size) {
+						_upload_file.close();
+						_need_header = true;
+					}
+					SPIMaster::set_state(state);
+				}
+				
+				_chunk_length = 0;
+			}
+		}
+	}
+
+	if (final == true) {
+		uint8_t state = SPIMaster::state;
+		SPIMaster::disable();
+		SPIMaster::select_sd();
+		_upload_file.close();
+		SPIMaster::set_state(state);
+		delete _chunk;
+		_controller->update_playlist_manager();
+		return;
+	}
+}
+
+void HTTPServer::_onEvent(AsyncWebSocket * server, AsyncWebSocketClient * client, AwsEventType type, void * arg, uint8_t *data, size_t len) {
+	if (type==WS_EVT_CONNECT) {
+		_controller->inform_new_client(client);
+	} else if (type==WS_EVT_DATA) {
+		AwsFrameInfo* info = (AwsFrameInfo*) arg;
+		if (info->final && info->index==0 && info->len==len && info->opcode==WS_TEXT) {
+			data[len]='\0';
+			DEBUG("Received ws message: %s\n", (char*)data);
+			_controller->queue_command((char*)data);
+		}
+	}
+}

src/main.cpp

@@ -1,42 +1,123 @@
 #include <Arduino.h>
 #include <SPI.h>
 #include <SD.h>
-#include <MCP23S17/MCP23S17.h>
+#include <WiFi.h>
+#include <ESPmDNS.h>
+#include <SPIFFS.h>
 #include "config.h"
 #include "controller.h"
 #include "player.h"
 #include "spi_master.h"
+#include "http_server.h"
+#include "playlist_manager.h"
 
 Controller* controller;
 Player* player;
-MCP* mcp;
+PlaylistManager* pm;
+HTTPServer* http_server;
+
+uint8_t SPIMaster::state = 0;
+
+bool connect_to_wifi(String ssid, String pass) {
+	TRACE("Connecting to wifi \"%s\"...\n", ssid.c_str());
+	WiFi.mode(WIFI_AP_STA);
+	WiFi.begin(ssid.c_str(), pass.c_str());
+	if (WiFi.waitForConnectResult() != WL_CONNECTED) {
+		DEBUG("Could not connect to wifi \"%s\".\n", ssid.c_str());
+		return false;
+	} else {
+		INFO("Connected to \"%s\". IP address: %s\n", ssid.c_str(), WiFi.localIP().toString().c_str());
+	}
+	return true;
+}
 
 void setup() {
 	delay(500);
 	Serial.begin(74880);
+	Serial.println("Starting...");
+	Serial.println("Started.");
 	INFO("Starting.\n");
+	#ifdef VERSION
+		INFO("ESMP3 version %s\n", VERSION);
+	#else
+		INFO("ESMP3, version unknown\n");
+	#endif
 	INFO("Initializing...\n");
 
 	DEBUG("Setting up SPI...\n");
 	SPI.begin();
+	SPI.setHwCs(false);
 	SPIMaster::init();
+	SPIMaster* spi = new SPIMaster();
 	INFO("SPI initialized.\n");
 
-	DEBUG("Setting up MCP...\n");
-	SPIMaster::enable(PIN_MCP);
-	mcp = new MCP(0, PIN_MCP);
-	INFO("MCP initialized.");
-
 	DEBUG("Setting up SD card...\n");
-	SPIMaster::enable(PIN_SD_CS);
-	if (SD.begin(PIN_SD_CS)) {
+	spi->select_sd();
+	if (SD.begin(42, SPI, 25000000)) {
 		INFO("SD card initialized.\n");
 	} else {
-		ERROR("Could not initialize SD card. Halting.\n");
-		while(1);
+		ERROR("Could not initialize SD card.\n");
+	}
+	spi->select_sd(false);
+
+	DEBUG("Starting SPIFFS...\n");
+	SPIFFS.begin(true);
+
+	DEBUG("Initializing PlaylistManager...\n");
+	pm = new PlaylistManager();
+	
+	DEBUG("Initializing Player and Controller...\n");
+	player = new Player(spi);
+    controller = new Controller(player, pm);
+    INFO("Player and controller initialized.\n");
+
+	bool connected = false;
+	INFO("Connecting to WiFi...\n");
+	SPIMaster::select_sd();
+	if (SD.exists("/_wifis.txt")) {
+		DEBUG("Reading /_wifis.txt\n");
+		File f = SD.open("/_wifis.txt", "r");
+		while (String line = f.readStringUntil('\n')) {
+			if (line.length()==0 || line.startsWith("#") || line.indexOf('=')==-1) {
+				continue;
+			}
+			String ssid = line.substring(0, line.indexOf('='));
+			String pass = line.substring(line.indexOf('=')+1);
+			connected = connect_to_wifi(ssid, pass);
+			if (connected) break;
+		}
+		f.close();
+	} else {
+		File f = SD.open("/_wifis.txt", "w");
+		f.print("# WiFi definitions. Syntax: <SSID>=<PASS>. Lines starting with # are ignored. Example:\n# My WiFi=VerySecretPassword\n");
+		f.close();
+	}
+	SPIMaster::select_sd(false);
+	if (!connected) {
+		DEBUG("Trying hardcoded WiFi data...\n");
+		connected = connect_to_wifi(WIFI_SSID, WIFI_PASS);
+	}
+	if (!connected) {
+		INFO("No WiFi connection!\n");
+	}
+	
+	MDNS.begin("esmp3");
+
+    DEBUG("Setting up HTTP server...\n");
+	http_server = new HTTPServer(player, controller);
+	controller->register_http_server(http_server);
+	
+	DEBUG("Starting NTP client...\n");
+	// Taken from https://github.com/esp8266/Arduino/blob/master/cores/esp8266/TZ.h
+	configTzTime("CET-1CEST,M3.5.0,M10.5.0/3", "europe.pool.ntp.org");
+	struct tm time;
+	if (getLocalTime(&time, 10000)) {
+		char buffer[100];
+		strftime(buffer, 100, "%Y-%m-%d %H:%M:%S", &time);
+		DEBUG("Got time: %s\n", buffer);
+	} else {
+		INFO("Could not fetch current time via NTP.\n");
 	}
-	player = new Player(mcp);
-    controller = new Controller(player, mcp);
 
     INFO("Initialization completed.\n");
 }

src/player.cpp

@@ -2,43 +2,53 @@
 
 #include "player.h"
 #include "spi_master.h"
+#include <ArduinoJson.h>
 
 //Player::_spi_settings
 
-Player::Player(MCP* m) {
-	_mcp = m;
-	_mcp->pinMode(XRESET, OUTPUT);
-	_mcp->digitalWrite(XRESET, HIGH);
-	pinMode(DREQ, INPUT);
+Player::Player(SPIMaster* s) {
+	_spi = s;
+	PIN_VS1053_XRESET_SETUP();
+	PIN_VS1053_XRESET(HIGH);
+	PIN_SPEAKER_L_SETUP();
+	PIN_SPEAKER_R_SETUP();
+	_speaker_off();
+	_spi->disable();
+	PIN_VS1053_DREQ_SETUP();
+	
+	init();
+}
 
-	_init();
+void Player::register_controller(Controller* c) {
+	_controller = c;
 }
 
 void Player::_reset() {
-	_mcp->digitalWrite(XRESET, LOW);
+	PIN_VS1053_XRESET(LOW);
 	delay(100);
-	_mcp->digitalWrite(XRESET, HIGH);
+	PIN_VS1053_XRESET(HIGH);
 	delay(100);
 	_state = uninitialized;
 	_spi_settings = &_spi_settings_slow; // After reset, communication has to be slow
 }
 
-void Player::_init() {
-	SPIMaster::disable();
+void Player::init() {
 	DEBUG("Resetting VS1053...\n");
 	_reset();
 
 	uint16_t result = _read_control_register(SCI_MODE);
 	DEBUG("SCI_MODE: 0x%04X\n", result);
 	if (result != 0x4800) {
-		ERROR("SCI_MODE was 0x%04X, expected was 0x4800.\n", result);
-		return;
+		ERROR("SCI_MODE was 0x%04X, expected was 0x4800. Rebooting.\n", result);
+		delay(500);
+		ESP.restart();
 	}
 	result = _read_control_register(SCI_STATUS);
 	DEBUG("SCI_STATUS: 0x%04X\n", result);
 	if (result != 0x0040 && result != 0x0048) {
-		ERROR("SCI_STATUS was 0x%04X, expected was 0x0040 or 0x0048.\n", result);
-		return;
+		ERROR("SCI_STATUS was 0x%04X, expected was 0x0040 or 0x0048. Rebooting.\n", result);
+		delay(500);
+		ESP.restart();
 	}
 	result = _read_control_register(SCI_CLOCKF);
 	DEBUG("SCI_CLOCKF: 0x%04X\n", result);
@@ -46,48 +56,102 @@ void Player::_init() {
 	DEBUG("VS1053 Init looking good.\n");
 	DEBUG("Upping VS1053 multiplier...\n");
 
-	_write_control_register(SCI_CLOCKF, 0x6000);
+	_write_control_register(SCI_CLOCKF, 0xC000);
 	delay(10);
 
 	_spi_settings = &_spi_settings_fast;
 
 	result = _read_control_register(SCI_CLOCKF);
 	DEBUG("SCI_CLOCKF: 0x%04X\n", result);
-	if (result != 0x6000) {
-		ERROR("Error: SCI_CLOCKF was 0x%04X, expected was 0x6000.\n", result);
-		return;
+	if (result != 0xC000) {
+		ERROR("Error: SCI_CLOCKF was 0x%04X, expected was 0xC000. Rebooting.\n", result);
+		delay(500);
+		ESP.restart();
 	}
 
 	set_volume(VOLUME_DEFAULT);
 
 	INFO("VS1053 initialization completed.\n");
 
-	INFO("Checking system sounds...\n");
-	SPIMaster::enable(PIN_SD_CS);
-	_check_system_sound("no_prev_song.mp3");
-	_check_system_sound("no_next_song.mp3");
-	_check_system_sound("volume_max.mp3");
-	_check_system_sound("volume_min.mp3");
-
 	_state = idle;
 }
 
-void Player::_check_system_sound(String filename) {
-	String path = String("/system/") + filename;
-	if (!SD.exists(path)) {
-		ERROR("System sound %s is missing on the sd card!\n", path.c_str());
-	} else {
-		DEBUG("%s found.\n", path.c_str());
-	}
+void Player::_speaker_off() {
+	DEBUG("Speaker off\n");
+	PIN_SPEAKER_L(LOW);
+	PIN_SPEAKER_R(LOW);
+}
+
+void Player::_speaker_on() {
+	DEBUG("Speaker on\n");
+	PIN_SPEAKER_L(HIGH);
+	PIN_SPEAKER_R(HIGH);
+}
+
+void Player::_sleep() {
+	DEBUG("VS1053 going to sleep.\n");
+	_speaker_off();
+	_write_control_register(SCI_CLOCKF, 0x0000);
+	_spi_settings = &_spi_settings_slow;
+	_write_control_register(SCI_AUDATA, 0x0010);
+	set_volume(0, false);
+	_state = sleeping;
+	TRACE("VS1053 is sleeping now.\n");
+}
+
+void Player::_wakeup() {
+	if (_state != sleeping && _state != recording) return;
+	_stopped_at = millis();
+	DEBUG("Waking VS1053...\n");
+	set_volume(_volume, false);
+	_write_control_register(SCI_AUDATA, 0x0000);
+	_write_control_register(SCI_CLOCKF, 0x6000);
+	_write_control_register(SCI_MODE, 0x4800 | SM_RESET);
+	delay(10);
+	//_speaker_on();
+	_spi_settings = &_spi_settings_fast;
+	_state = idle;
+}
+
+void Player::_record() {
+	// http://www.vlsi.fi/fileadmin/software/VS10XX/VS1053_VS1063_PcmRecorder.pdf
+	DEBUG("Starting recording.\n");
+	set_volume(1, false);
+	
+	// Disable SCI_BASS
+	_write_control_register(SCI_BASS, 0);
+	
+	// Disable user applications
+	_write_control_register(SCI_AIADDR, 0);
+	
+	// Disable interrupts
+	_write_control_register(SCI_WRAMADDR, 0xC01A);
+	_write_control_register(SCI_WRAM, 0x0002);
+	
+	_patch_adpcm();
+	
+	_write_control_register(SCI_MODE, SM_ADPCM);
+	
+	_write_control_register(SCI_AICTRL0, 0x8000); // Mono VU meter
+	_write_control_register(SCI_AICTRL1, 1024); // Manual gain, 1x
+	_write_control_register(SCI_AICTRL2, 0); // Maximum gain for autogain - ignored
+	_write_control_register(SCI_AICTRL3, 0); // status: record
+	
+	_write_control_register(SCI_AIADDR, 0x0034, false);
+	delay(1);
+	
+	DEBUG("Recording.\n");
+	delay(10);
+	_state = recording;
 }
 
 inline void Player::_wait() {
-	while(!digitalRead(DREQ));
+	while(!PIN_VS1053_DREQ());
 }
 
-uint16_t Player::_read_control_register(uint8_t address) {
-	_wait();
-	SPIMaster::enable(XCS);
+uint16_t Player::_read_control_register(uint8_t address, bool do_wait) {
+	if (do_wait) _wait();
+	_spi->select_vs1053_xcs();
 	SPI.beginTransaction(*_spi_settings);
 	SPI.transfer(CMD_READ);
 	SPI.transfer(address);
@@ -96,34 +160,268 @@ uint16_t Player::_read_control_register(uint8_t address) {
 	uint8_t b2 = SPI.transfer(0xFF);
 	_wait();
 	SPI.endTransaction();
-	SPIMaster::disable();
+	_spi->select_vs1053_xcs(false);
 
 	return (b1 << 8) | b2;
 }
 
-void Player::_write_control_register(uint8_t address, uint16_t value) {
-	uint8_t b1 = value >> 8;
-	uint8_t b2 = value & 0xFF;
+void Player::_write_control_register(uint8_t address, uint16_t value, bool do_wait) {
 	_wait();
-	SPIMaster::enable(XCS);
+	_spi->select_vs1053_xcs();
 	SPI.beginTransaction(*_spi_settings);
 	SPI.transfer(CMD_WRITE);
 	SPI.transfer(address);
-	SPI.transfer(b1);
-	SPI.transfer(b2);
-	_wait();
+	SPI.transfer(value >> 8);
+	SPI.transfer(value & 0xFF);
 	SPI.endTransaction();
-	SPIMaster::disable();
+	_spi->select_vs1053_xcs(false);
+	if (do_wait) _wait();
+}
+
+void Player::_patch_adpcm() {
+	static const uint16_t patch_data[] = {
+		0x0007, 0x0001, 0xc01a, 0x0006, 0x0001, 0x0002, 0x0007, 0x0001, /*    0 */
+		0x0008, 0x0006, 0x8002, 0x0000, 0x0007, 0x0001, 0x000c, 0x0006, /*    8 */
+		0x0002, 0x7000, 0x0017, 0x0007, 0x0001, 0x8034, 0x0006, 0x0022, /*   10 */
+		0x0030, 0x0490, 0xb080, 0x0024, 0x3800, 0x0024, 0x0000, 0x1090, /*   18 */
+		0xf400, 0x5404, 0x0000, 0x0851, 0xf400, 0x5648, 0xf400, 0x5404, /*   20 */
+		0xf400, 0x5658, 0xf400, 0x5404, 0xf400, 0x5640, 0x0000, 0x800a, /*   28 */
+		0x2900, 0x9180, 0x0006, 0x2016, 0x2a00, 0x1bce, 0x2a00, 0x114e, /*   30 */
+		0x2a00, 0x168e, 0x0007, 0x0001, 0x1800, 0x0006, 0x8006, 0x0000, /*   38 */
+		0x0007, 0x0001, 0x8045, 0x0006, 0x002a, 0x3e12, 0xb817, 0x3e12, /*   40 */
+		0x7808, 0x3e18, 0x3821, 0x3e18, 0xb823, 0x3e15, 0x4024, 0x3e10, /*   48 */
+		0x7800, 0x48b2, 0x0024, 0x0000, 0x800a, 0x2900, 0x3e80, 0x3e10, /*   50 */
+		0x7800, 0x36f0, 0x5800, 0x2210, 0x0000, 0x36f0, 0x5800, 0x36f5, /*   58 */
+		0x4024, 0x36f8, 0x9823, 0x36f8, 0x1821, 0x36f2, 0x5808, 0x3602, /*   60 */
+		0x8024, 0x0030, 0x0717, 0x2100, 0x0000, 0x3f05, 0xdbd7, 0x0007, /*   68 */
+		0x0001, 0x805a, 0x0006, 0x002a, 0x3e12, 0xb817, 0x3e12, 0x7808, /*   70 */
+		0x3e18, 0x3821, 0x3e18, 0xb823, 0x3e15, 0x4024, 0x3e10, 0x7800, /*   78 */
+		0x48b2, 0x0024, 0x0000, 0x800a, 0x2900, 0x5e40, 0x3e10, 0x7800, /*   80 */
+		0x36f0, 0x5800, 0x2210, 0x0000, 0x36f0, 0x5800, 0x36f5, 0x4024, /*   88 */
+		0x36f8, 0x9823, 0x36f8, 0x1821, 0x36f2, 0x5808, 0x3602, 0x8024, /*   90 */
+		0x0030, 0x0717, 0x2100, 0x0000, 0x3f05, 0xdbd7, 0x0007, 0x0001, /*   98 */
+		0x806f, 0x0006, 0x0030, 0x3e12, 0xb817, 0x3e12, 0x7808, 0x3e18, /*   a0 */
+		0x3821, 0x3e18, 0xb823, 0x3e10, 0x7800, 0xb880, 0x3855, 0x0030, /*   a8 */
+		0x0497, 0x48b2, 0x3c00, 0x0000, 0x800a, 0x2900, 0x7300, 0x3e10, /*   b0 */
+		0x7800, 0x36f0, 0x5800, 0x2210, 0x0000, 0x6890, 0x1bd5, 0x0030, /*   b8 */
+		0x0497, 0x3f00, 0x0024, 0x36f0, 0x5800, 0x36f8, 0x9823, 0x36f8, /*   c0 */
+		0x1821, 0x36f2, 0x5808, 0x3602, 0x8024, 0x0030, 0x0717, 0x2100, /*   c8 */
+		0x0000, 0x3f05, 0xdbd7, 0x0007, 0x0001, 0x8010, 0x0006, 0x000e, /*   d0 */
+		0x3e02, 0x8024, 0x0001, 0x000a, 0x6012, 0x0024, 0xfea2, 0x0024, /*   d8 */
+		0x48b2, 0x1bca, 0x2000, 0x0000, 0x4180, 0x0024, 0x0007, 0x0001, /*   e0 */
+		0x8087, 0x0006, 0x00e6, 0x3e00, 0x7843, 0x3e01, 0x3845, 0x3e04, /*   e8 */
+		0x3812, 0x0006, 0x08d0, 0x3000, 0x4024, 0x6182, 0x0024, 0x0030, /*   f0 */
+		0x06d0, 0x2800, 0x2655, 0xb882, 0x0024, 0x0000, 0x0201, 0x0000, /*   f8 */
+		0x0005, 0x0030, 0x0210, 0xa016, 0x4004, 0x1fff, 0xfe01, 0xae1a, /*  100 */
+		0x0024, 0xc342, 0x0024, 0xb882, 0x2001, 0x0030, 0x06d0, 0x3800, /*  108 */
+		0x4024, 0x0006, 0x0890, 0x3004, 0x0024, 0x3000, 0x4024, 0x0006, /*  110 */
+		0x12d0, 0x6182, 0x0024, 0x3000, 0x4024, 0x2800, 0x3e05, 0xf400, /*  118 */
+		0x4050, 0x3009, 0x2000, 0x0006, 0x08d0, 0x0006, 0x0892, 0x3000, /*  120 */
+		0x4024, 0x6192, 0x0024, 0x3800, 0x4024, 0x0030, 0x0250, 0xb882, /*  128 */
+		0x2001, 0x0030, 0x0710, 0x3800, 0x4024, 0x0006, 0x12d0, 0x3000, /*  130 */
+		0x4024, 0x6192, 0x0024, 0x3800, 0x4024, 0x3204, 0x0024, 0x3023, /*  138 */
+		0x0024, 0x30e0, 0xc024, 0x6312, 0x0024, 0x0000, 0x00c3, 0x2800, /*  140 */
+		0x3141, 0x0000, 0x0024, 0x3033, 0x0024, 0x3a04, 0x0024, 0x3000, /*  148 */
+		0x4024, 0x6182, 0x0024, 0x0006, 0x0890, 0x2800, 0x2fd8, 0x0006, /*  150 */
+		0x0301, 0x3a00, 0x4024, 0x0000, 0x00c3, 0x3004, 0x0024, 0x3013, /*  158 */
+		0x0024, 0x3000, 0x4024, 0x0006, 0x12d0, 0x3800, 0x4024, 0x0030, /*  160 */
+		0x0310, 0xf000, 0x0001, 0x6236, 0x0024, 0x001f, 0xffc3, 0x2800, /*  168 */
+		0x3395, 0x0000, 0x0024, 0x0000, 0x0203, 0xa132, 0x0024, 0x001f, /*  170 */
+		0xffc3, 0xb136, 0x0024, 0x6306, 0x0024, 0x0000, 0x0024, 0x2800, /*  178 */
+		0x3611, 0x0000, 0x0024, 0x0020, 0x0003, 0xb132, 0x0024, 0x0000, /*  180 */
+		0x0024, 0x2800, 0x3a85, 0x0000, 0x0024, 0x0000, 0x0081, 0xb212, /*  188 */
+		0x0024, 0x0000, 0x0024, 0x2800, 0x3a05, 0x0000, 0x0024, 0x6892, /*  190 */
+		0x0024, 0xb212, 0x0024, 0x0000, 0x0005, 0x2800, 0x3c55, 0x0030, /*  198 */
+		0x0310, 0x0000, 0x3fc1, 0x3000, 0x8024, 0xb214, 0x0024, 0x003f, /*  1a0 */
+		0xc001, 0xb010, 0x0024, 0xc200, 0x0024, 0x0030, 0x0310, 0x3800, /*  1a8 */
+		0x0024, 0x36f4, 0x1812, 0x36f1, 0x1805, 0x36f0, 0x5803, 0x2000, /*  1b0 */
+		0x0000, 0x0000, 0x0024, 0x0030, 0x0310, 0x0000, 0x0005, 0x003f, /*  1b8 */
+		0xc001, 0x4088, 0x0002, 0xb214, 0x0024, 0x1fff, 0xfe01, 0xae12, /*  1c0 */
+		0x0024, 0x2800, 0x3a00, 0xc200, 0x0024, 0x2800, 0x28c0, 0x3800, /*  1c8 */
+		0x0024, 0x0007, 0x0001, 0x80fa, 0x0006, 0x00fe, 0x3e12, 0x0024, /*  1d0 */
+		0x3e05, 0xb814, 0x3615, 0x0024, 0x3e00, 0x3841, 0x3e00, 0xb843, /*  1d8 */
+		0x3e01, 0x3845, 0x3e04, 0x3851, 0x0030, 0x10d0, 0x3e04, 0x8024, /*  1e0 */
+		0x3010, 0x0024, 0x3000, 0x8024, 0x0006, 0x1190, 0x3000, 0x4024, /*  1e8 */
+		0x6182, 0x0024, 0x0000, 0x0024, 0x2800, 0x5dd5, 0x0000, 0x0024, /*  1f0 */
+		0x0030, 0x03d0, 0x0000, 0x00c1, 0x3000, 0xc024, 0xb318, 0x0024, /*  1f8 */
+		0x6896, 0x0024, 0x6436, 0x0024, 0x0020, 0x0003, 0x2800, 0x59c5, /*  200 */
+		0x0000, 0x0024, 0x0006, 0x1150, 0x3000, 0x4024, 0x6136, 0x0024, /*  208 */
+		0x0000, 0x0024, 0x2800, 0x4741, 0x0000, 0x0024, 0x0000, 0x0803, /*  210 */
+		0x4132, 0x0024, 0x3800, 0x4024, 0x0006, 0x0190, 0x0006, 0xf011, /*  218 */
+		0x2900, 0xb500, 0x3613, 0x0024, 0x0006, 0xf011, 0x0006, 0x1152, /*  220 */
+		0x0006, 0x0250, 0x4082, 0x0800, 0xfe82, 0x184c, 0x1fff, 0xfc41, /*  228 */
+		0x48ba, 0x0024, 0xae1a, 0x0024, 0x2900, 0xb500, 0x4280, 0x4103, /*  230 */
+		0x0006, 0x1110, 0x4084, 0x0800, 0xfe84, 0x0002, 0x48ba, 0x0024, /*  238 */
+		0xae12, 0x0024, 0xf400, 0x4001, 0x0000, 0x0180, 0x6200, 0x0024, /*  240 */
+		0x0000, 0x0080, 0x2800, 0x5241, 0x4200, 0x0024, 0x3800, 0x0024, /*  248 */
+		0x0006, 0x1090, 0x3004, 0x8024, 0xf400, 0x4491, 0x3113, 0x0024, /*  250 */
+		0x3804, 0x4024, 0x3a00, 0xc024, 0x3004, 0x8024, 0xf400, 0x4491, /*  258 */
+		0x3113, 0x0024, 0x3804, 0x4024, 0x3a00, 0x4024, 0x0006, 0x1081, /*  260 */
+		0x3000, 0x0024, 0x6012, 0x0024, 0x0006, 0x0f00, 0x2800, 0x5248, /*  268 */
+		0x0000, 0x0024, 0x3800, 0x0024, 0x0030, 0x0010, 0x0000, 0x0080, /*  270 */
+		0x3000, 0x4024, 0x0030, 0x0710, 0xb104, 0x0024, 0x0000, 0x0001, /*  278 */
+		0x3800, 0x4024, 0x0006, 0x08d0, 0x3001, 0x0024, 0x0006, 0x0910, /*  280 */
+		0x3000, 0x4024, 0x6100, 0x0024, 0x6042, 0x0024, 0x0030, 0x06d0, /*  288 */
+		0x2800, 0x5711, 0xb880, 0x0024, 0x2900, 0x21c0, 0x4380, 0x184c, /*  290 */
+		0xb880, 0x0024, 0x3800, 0x0024, 0x36f4, 0x8024, 0x36f4, 0x1811, /*  298 */
+		0x36f1, 0x1805, 0x36f0, 0x9803, 0x36f0, 0x1801, 0x3405, 0x9014, /*  2a0 */
+		0x36f3, 0x0024, 0x36f2, 0x0024, 0x2000, 0x0000, 0x0000, 0x0024, /*  2a8 */
+		0x0006, 0x1152, 0x0000, 0x0804, 0x3200, 0xc024, 0x6346, 0x0024, /*  2b0 */
+		0x6386, 0x2803, 0x0000, 0x0024, 0x2800, 0x4755, 0x0000, 0x0024, /*  2b8 */
+		0x3800, 0x4024, 0x0030, 0x0690, 0x0000, 0x0081, 0xb882, 0x22c1, /*  2c0 */
+		0x3800, 0x4024, 0x0030, 0x0590, 0x2800, 0x4740, 0x3800, 0x4024, /*  2c8 */
+		0x2800, 0x5700, 0x4190, 0x0024, 0x0007, 0x0001, 0x8179, 0x0006, /*  2d0 */
+		0x00a6, 0x3e12, 0x0024, 0x3e05, 0xb814, 0x3625, 0x0024, 0x3e00, /*  2d8 */
+		0x3841, 0x3e00, 0xb843, 0x3e04, 0x3851, 0x0006, 0x1110, 0x3e04, /*  2e0 */
+		0xb813, 0x3000, 0x0024, 0x6080, 0x0024, 0x0006, 0x11d2, 0x2800, /*  2e8 */
+		0x70c5, 0x0000, 0x0081, 0x6010, 0x984c, 0x3800, 0x0024, 0x0006, /*  2f0 */
+		0x10d0, 0x3200, 0x0024, 0xf100, 0x0011, 0xf100, 0x0024, 0xf102, /*  2f8 */
+		0x0400, 0x0006, 0x1311, 0x2900, 0x0400, 0x3100, 0x8024, 0x0030, /*  300 */
+		0x1293, 0x3413, 0x184c, 0x3c04, 0x4024, 0x3b00, 0x0024, 0x3004, /*  308 */
+		0xc024, 0xf400, 0x44d1, 0x3113, 0x0024, 0x3804, 0x4024, 0x3310, /*  310 */
+		0x0024, 0x3a00, 0x0024, 0x0006, 0x1212, 0x3200, 0x0024, 0xf100, /*  318 */
+		0x13d1, 0xf100, 0x0402, 0x2900, 0x0400, 0xf102, 0x0c00, 0x0030, /*  320 */
+		0x12d1, 0x0006, 0x1081, 0x3900, 0x0024, 0x3004, 0xc024, 0xf400, /*  328 */
+		0x44d1, 0x3113, 0x0024, 0x3804, 0x4024, 0x3300, 0x0024, 0x3a00, /*  330 */
+		0x0024, 0xf400, 0x4440, 0x6010, 0x0024, 0x1fee, 0xe002, 0x2800, /*  338 */
+		0x6bc8, 0x0006, 0x0f00, 0x3800, 0x0024, 0x0006, 0x0010, 0xb886, /*  340 */
+		0x0040, 0x30f0, 0x4024, 0x6c92, 0x40c3, 0x3810, 0x0024, 0xb182, /*  348 */
+		0x23c1, 0x0006, 0x0950, 0x3000, 0x0024, 0x6090, 0x0024, 0x6cd2, /*  350 */
+		0x2000, 0x0000, 0x0000, 0x2800, 0x70c8, 0x0000, 0x0024, 0x3800, /*  358 */
+		0x0024, 0x0000, 0x0210, 0x3010, 0x0024, 0x30f0, 0x4024, 0x6c92, /*  360 */
+		0x0024, 0x3810, 0x0024, 0x38f0, 0x4024, 0x36f4, 0x9813, 0x36f4, /*  368 */
+		0x1811, 0x36f0, 0x9803, 0x36f0, 0x1801, 0x3405, 0x9014, 0x36f3, /*  370 */
+		0x0024, 0x36f2, 0x0024, 0x2000, 0x0000, 0x0000, 0x0024, 0x0007, /*  378 */
+		0x0001, 0x81cc, 0x0006, 0x00f4, 0x3e00, 0x3841, 0x0000, 0x0201, /*  380 */
+		0x3e00, 0xb843, 0x3e01, 0x3845, 0x3e04, 0x3812, 0x0030, 0x0410, /*  388 */
+		0x3000, 0x0024, 0x6012, 0x0024, 0x0006, 0x08d0, 0x2800, 0x8045, /*  390 */
+		0x0000, 0x0181, 0x6012, 0x0024, 0x0006, 0x1250, 0x2800, 0x7e45, /*  398 */
+		0x0000, 0x05c1, 0x6012, 0x0024, 0x0030, 0x01d0, 0x2800, 0x7c45, /*  3a0 */
+		0x0000, 0x0581, 0x6010, 0x03cc, 0x0000, 0x0024, 0x2800, 0x7a95, /*  3a8 */
+		0x0000, 0x0024, 0x3000, 0x8024, 0x0006, 0x1250, 0x3000, 0x0024, /*  3b0 */
+		0x6092, 0x0024, 0x3800, 0x4024, 0xf400, 0x4010, 0x3800, 0x8024, /*  3b8 */
+		0x36f4, 0x1812, 0x36f1, 0x1805, 0x36f0, 0x9803, 0x36f0, 0x1801, /*  3c0 */
+		0x2000, 0x0000, 0x0000, 0x0024, 0x0030, 0x01d0, 0x3000, 0x0024, /*  3c8 */
+		0x0006, 0x1250, 0x3800, 0x0024, 0xf400, 0x4010, 0x3000, 0x0024, /*  3d0 */
+		0x0030, 0x0190, 0x2800, 0x7a80, 0x3800, 0x0024, 0x3000, 0x0024, /*  3d8 */
+		0x6090, 0x0024, 0x3800, 0x0024, 0xf400, 0x4010, 0x3000, 0x0024, /*  3e0 */
+		0x0030, 0x0190, 0x2800, 0x7a80, 0x3800, 0x0024, 0x3000, 0x0024, /*  3e8 */
+		0x6080, 0x0024, 0x0000, 0x0024, 0x2800, 0x8515, 0x0000, 0x0024, /*  3f0 */
+		0x0006, 0x1350, 0x0000, 0x0082, 0x0030, 0x0352, 0xb886, 0x0040, /*  3f8 */
+		0x30f0, 0x4024, 0x4cd2, 0x0024, 0x3810, 0x0024, 0x38f0, 0x4024, /*  400 */
+		0x3a00, 0x0024, 0x3010, 0x0024, 0x30f0, 0x4024, 0x0030, 0x0390, /*  408 */
+		0x2800, 0x7a80, 0x4180, 0x2001, 0x4090, 0x0024, 0x3800, 0x0024, /*  410 */
+		0x0030, 0x0250, 0x3800, 0x0024, 0x0006, 0x1290, 0x3000, 0x0024, /*  418 */
+		0x6090, 0x0024, 0x3800, 0x0024, 0x0006, 0x0850, 0x3004, 0x8024, /*  420 */
+		0x3223, 0x0024, 0x32e0, 0x4024, 0x6100, 0x0024, 0x0000, 0x0024, /*  428 */
+		0x2800, 0x8c81, 0x0000, 0x0024, 0x3233, 0x0024, 0x3804, 0x8024, /*  430 */
+		0x3200, 0x0024, 0x6080, 0x0024, 0x0006, 0x0300, 0x2800, 0x8b18, /*  438 */
+		0x0000, 0x0024, 0x3800, 0x0024, 0x0006, 0x0850, 0x3004, 0x0024, /*  440 */
+		0x3013, 0x0024, 0x3000, 0x0024, 0x0006, 0x1290, 0x3800, 0x0024, /*  448 */
+		0x0006, 0x0850, 0x3004, 0x0024, 0x3000, 0x0024, 0x0006, 0x1290, /*  450 */
+		0x6080, 0x0024, 0x3000, 0x0024, 0x2800, 0x9115, 0xf400, 0x4010, /*  458 */
+		0x3000, 0x0024, 0x0000, 0x0201, 0x0000, 0x0005, 0x0030, 0x0210, /*  460 */
+		0xa014, 0x4004, 0x1fff, 0xfe01, 0xae12, 0x0024, 0xc200, 0x0024, /*  468 */
+		0x2800, 0x8180, 0x3800, 0x0024, 0x2800, 0x8ec0, 0x3009, 0x0000, /*  470 */
+		0x0007, 0x0001, 0x8246, 0x0006, 0x0104, 0x0030, 0x1092, 0x0007, /*  478 */
+		0x9250, 0x003f, 0xfc42, 0xb880, 0x184c, 0x3e12, 0x0024, 0x3800, /*  480 */
+		0x0024, 0x0030, 0x0290, 0x38f0, 0x0024, 0x3800, 0x0024, 0x0030, /*  488 */
+		0x0050, 0x3000, 0x4024, 0xb122, 0x0024, 0x6894, 0x2001, 0x0000, /*  490 */
+		0x0141, 0x3a70, 0x4024, 0x0004, 0x1fc1, 0x3a00, 0x4024, 0x0030, /*  498 */
+		0x00d2, 0x0030, 0x0001, 0x3a00, 0x4024, 0x0030, 0x0552, 0x3a10, /*  4a0 */
+		0x0024, 0x3a00, 0x0024, 0x3000, 0x4024, 0xc122, 0x0024, 0x3800, /*  4a8 */
+		0x4024, 0x0030, 0x05d0, 0x0000, 0x03c1, 0x3820, 0x4024, 0x3800, /*  4b0 */
+		0x0024, 0x0000, 0x0310, 0x3010, 0x0024, 0x30f0, 0x4024, 0xf2c2, /*  4b8 */
+		0x0024, 0x3810, 0x0024, 0x0000, 0x3fc0, 0x38f0, 0x4024, 0x0030, /*  4c0 */
+		0x02d0, 0x3000, 0x4024, 0x2912, 0x1400, 0xb104, 0x0024, 0x0006, /*  4c8 */
+		0x1312, 0x6802, 0x0024, 0x000d, 0xac00, 0x6012, 0x2801, 0x0000, /*  4d0 */
+		0x0024, 0x2800, 0x9dc1, 0x0000, 0x0024, 0x3a00, 0x0024, 0x2909, /*  4d8 */
+		0x1b40, 0x3613, 0x0024, 0x0000, 0x0084, 0x0000, 0x1905, 0x2908, /*  4e0 */
+		0xbe80, 0x3613, 0x0024, 0x0000, 0x0000, 0x0006, 0x0302, 0x4002, /*  4e8 */
+		0x0024, 0x4012, 0x0024, 0x4212, 0x0024, 0xf400, 0x4050, 0x3000, /*  4f0 */
+		0x4024, 0x6182, 0x0024, 0x0006, 0x0350, 0x2800, 0xa6c8, 0x0000, /*  4f8 */
+		0x0024, 0x4002, 0x0024, 0x4014, 0x0024, 0x0006, 0x0301, 0x4124, /*  500 */
+		0x0024, 0x0000, 0x0081, 0x4212, 0x0024, 0x4002, 0x4050, 0x4014, /*  508 */
+		0x0003, 0x0006, 0x0301, 0x4122, 0x0024, 0x6192, 0x0024, 0x6090, /*  510 */
+		0x4050, 0x3000, 0x4024, 0x0006, 0x0910, 0x6312, 0x0024, 0x6194, /*  518 */
+		0x0001, 0x4122, 0x0024, 0x2800, 0x9f80, 0x3800, 0x4024, 0x0006, /*  520 */
+		0x12d2, 0x0006, 0x0991, 0x3000, 0x0024, 0x0006, 0x1290, 0x3a00, /*  528 */
+		0x0024, 0x3800, 0x0024, 0xf400, 0x4010, 0x2900, 0xb200, 0x0000, /*  530 */
+		0x0580, 0x0030, 0x0210, 0x0014, 0x9240, 0x003f, 0xf502, 0x003f, /*  538 */
+		0xffc3, 0x3800, 0x0024, 0x0000, 0x0580, 0x0006, 0x1350, 0x3200, /*  540 */
+		0x4024, 0x4102, 0x0024, 0x3a00, 0x4024, 0x3810, 0x8024, 0x38f0, /*  548 */
+		0xc024, 0x0006, 0x08d0, 0x3800, 0x0024, 0x0030, 0x0690, 0x0000, /*  550 */
+		0x8280, 0xb880, 0x2080, 0x3800, 0x0024, 0x6890, 0x2000, 0x0030, /*  558 */
+		0x0490, 0x3800, 0x0024, 0x0030, 0x0010, 0x0000, 0x0100, 0x3000, /*  560 */
+		0x584c, 0xb100, 0x0024, 0x0000, 0x0024, 0x2800, 0xb185, 0x0000, /*  568 */
+		0x0024, 0x003f, 0xfec1, 0x3000, 0x1bcc, 0xb010, 0x0024, 0x2908, /*  570 */
+		0x0b80, 0x3800, 0x0024, 0x3613, 0x0024, 0x2910, 0x0180, 0x0000, /*  578 */
+		0xae48, 0x0007, 0x0001, 0x1806, 0x0006, 0x8007, 0x0000, 0x0006, /*  580 */
+		0x002f, 0x0010, 0x17ff, 0x0000, 0x1a00, 0x1dff, 0x0000, 0x1f00, /*  588 */
+		0x3fff, 0x0001, 0x0000, 0x17ff, 0x0001, 0x1c00, 0x3fff, 0x0001, /*  590 */
+		0xe000, 0xfffd, 0xffff, 0x0000, 0x0000, 0x180c, 0x180c, 0x0000, /*  598 */
+		0x0000, 0x0000, 0x4952, 0x4646, 0xffff, 0xffff, 0x4157, 0x4556, /*  5a0 */
+		0x6d66, 0x2074, 0x0010, 0x0000, 0x0001, 0x0001, 0xbb80, 0x0000, /*  5a8 */
+		0x7700, 0x0001, 0x0002, 0x0010, 0x6164, 0x6174, 0xffff, 0xffff, /*  5b0 */
+		0x0006, 0x8006, 0x0000, 0x0006, 0x0005, 0x183c, 0x183c, 0x0000, /*  5b8 */
+		0x0020, 0x0040, 0x0006, 0x8003, 0x0000, 0x0007, 0x0001, 0x5bc0, /*  5c0 */
+		0x0006, 0x0009, 0x801c, 0x7fe4, 0x8039, 0x804e, 0x7fb2, 0x809d, /*  5c8 */
+		0x809c, 0x7f64, 0x8139, 0x0007, 0x0001, 0x82c8, 0x0006, 0x0018, /*  5d0 */
+		0x4080, 0x184c, 0x3e13, 0x780f, 0x2800, 0xb405, 0x4090, 0x380e, /*  5d8 */
+		0x2400, 0xb3c0, 0xf400, 0x4417, 0x3110, 0x0024, 0x3f10, 0x0024, /*  5e0 */
+		0x36f3, 0x8024, 0x36f3, 0x580f, 0x2000, 0x0000, 0x0000, 0x0024, /*  5e8 */
+		0x0007, 0x0001, 0x82d4, 0x0006, 0x002a, 0x3e11, 0xb807, 0x3009, /*  5f0 */
+		0x384a, 0x3e11, 0x3805, 0x3e10, 0xb803, 0x3e00, 0x4442, 0x0001, /*  5f8 */
+		0x800a, 0xbf8e, 0x8443, 0xfe06, 0x0045, 0x3011, 0x0401, 0x545e, /*  600 */
+		0x0385, 0x525e, 0x2040, 0x72ce, 0x1bc1, 0x48ba, 0x9803, 0x4588, /*  608 */
+		0x4885, 0x6fee, 0x1bc2, 0x4ffe, 0x9805, 0xf6fe, 0x1bc4, 0xf7f0, /*  610 */
+		0x2046, 0x3801, 0xdbca, 0x2000, 0x0000, 0x36f1, 0x9807,
+	};
+	const uint16_t patch_size = 1567;
+	DEBUG("Patching...\n");
+
+	_spi->select_vs1053_xcs();
+	SPI.beginTransaction(*_spi_settings);
+	
+	for (int i=0; i<patch_size; i++) {
+		DEBUG("  %d\n", i);
+		unsigned short addr, n, val;
+		addr = patch_data[i++];
+		n = patch_data[i++];
+		SPI.transfer(CMD_WRITE);
+		SPI.transfer(addr & 0XFF);
+		if (n & 0x8000U) { /* RLE run, replicate n samples */
+			n &= 0x7FFF;
+			val = patch_data[i++];
+			while (n--) {
+				SPI.transfer(val >> 8);
+				SPI.transfer(val & 0xFF);
+				_wait();
+			}
+		} else {           /* Copy run, copy n samples */
+			while (n--) {
+				val = patch_data[i++];
+				SPI.transfer(val >> 8);
+				SPI.transfer(val & 0xFF);
+				_wait();
+			}
+		}
+	}
+
+	SPI.endTransaction();
+	_spi->select_vs1053_xcs(false);
+
+	DEBUG("Patch sent.\n");
 }
 
 void Player::_write_data(uint8_t* buffer) {
-	SPIMaster::enable(XDCS);
+	_spi->select_vs1053_xdcs();
 	SPI.beginTransaction(*_spi_settings);
 	for (uint i=0; i<sizeof(_buffer); i++) {
 		SPI.transfer(_buffer[i]);
 	}
 	SPI.endTransaction();
-	SPIMaster::disable();
+	_spi->select_vs1053_xdcs(false);
 }
 
 uint16_t Player::_read_wram(uint16_t address) {
@@ -159,174 +457,108 @@ void Player::set_volume(uint8_t vol, bool save) {
 	}
 	INFO("Setting volume to %d\n", vol);
 	vol = 0xFF - vol;
-	if (vol==0xFF) vol=0xFE;
 	uint16_t value = (vol<<8)|vol;
 	DEBUG("Setting volume register to 0x%04X\n", value);
 	_write_control_register(SCI_VOL, value);
 }
 
 void Player::vol_up() {
-	if (_volume == VOLUME_MAX) play_system_sound("volume_max.mp3");
-	else if (_volume + VOLUME_STEP > VOLUME_MAX) set_volume(VOLUME_MAX);
-	else set_volume(_volume + VOLUME_STEP);
+	if (!is_playing()) return;
+	uint8_t vol = _volume + VOLUME_STEP;
+	if (vol > VOLUME_MAX) vol=VOLUME_MAX;
+	set_volume(vol);
 }
 
 void Player::vol_down() {
-	if (_volume >= VOLUME_MIN + VOLUME_STEP) set_volume(_volume - VOLUME_STEP);
-	else if (_volume == VOLUME_MIN) play_system_sound("volume_min.mp3");
-	else set_volume(VOLUME_MIN);
+	if (!is_playing()) return;
+	uint8_t vol = _volume - VOLUME_STEP;
+	if (vol < VOLUME_MIN) vol=VOLUME_MIN;
+	set_volume(vol);
 }
 
 void Player::_mute() {
-	INFO("Muting.");
-	set_volume(0, false);
+	INFO("Muting.\n");
+	_speaker_off();
+	set_volume(1, false);
 }
 
 void Player::_unmute() {
-	INFO("Unmuting.");
+	INFO("Unmuting.\n");
 	set_volume(_volume, false);
+	_speaker_on();
 }
 
 void Player::track_next() {
 	if (_state != playing) return;
-	if (_playing_index + 1 >= _playing_album_songs) {
-		play_system_sound("no_next_song.mp3");
+	if (!_current_playlist->has_track_next()) {
 		return;
 	}
 	stop();
-	play_song(_playing_album, _playing_index + 1);
+	_current_playlist->track_next();
+	play();
 }
 
 void Player::track_prev() {
 	if (_state != playing) return;
 	if (_current_play_position > 100000) {
 		stop();
-		play_song(_playing_album, _playing_index);
+		_current_playlist->track_restart();
+		play();
 	} else {
-		if (_playing_index == 0) {
-			play_system_sound("no_prev_song.mp3");
+		if (!_current_playlist->has_track_prev()) {
 			return;
 		}
 		stop();
-		play_song(_playing_album, _playing_index - 1);
+		_current_playlist->track_prev();
+		play();
 	}
 }
 
-std::list<String> Player::ls(String path) {
-	SPIMaster::enable(PIN_SD_CS);
-	std::list<String> result;
-	if (!SD.exists(path)) return result;
-	File dir = SD.open(path);
-	File entry;
-	while (entry = dir.openNextFile()) {
-		String filename = entry.name();
-		if (entry.isDirectory()) filename.concat("/");
-		result.push_back(filename);
-	}
-	return result;
+void Player::set_track(uint8_t id) {
+	stop();
+	_current_playlist->set_track(id);
+	play();
 }
 
-String Player::_find_album_dir(String id) {
-	String id_with_divider = id + " - ";
-	File root = SD.open("/");
-	File entry;
-	String result = String("");
-	while ((result.length()==0) && (entry = root.openNextFile())) {
-		String name = entry.name();
-		if (entry.isDirectory() && (name.startsWith(id_with_divider) || name.equals(id))) {
-			result = name;
-		}
-		entry.close();
-	}
-	root.close();
-	return result;
+bool Player::is_playing() {
+	return _state == playing;
 }
 
-std::list<String> Player::_files_in_dir(String path) {
-	DEBUG("Examining folder %s...\n", path.c_str());
-	if (!path.startsWith("/")) path = String("/") + path;
-	if (!path.endsWith("/")) path.concat("/");
-	std::list<String> result;
-	if (!SD.exists(path)) return result;
-	File dir = SD.open(path);
-	File entry;
-	while (entry = dir.openNextFile()) {
-		String filename = entry.name();
-		if (!entry.isDirectory() &&
-		    !filename.startsWith(".") &&
-		    ( filename.endsWith(".mp3") ||
-		      filename.endsWith(".ogg") ||
-		      filename.endsWith(".wma") ||
-		      filename.endsWith(".mp4") ||
-		      filename.endsWith(".mpa"))) {
-			DEBUG("    Adding entry %s\n", filename.c_str());
-			result.push_back(path + filename);
-		} else {
-			DEBUG("  Ignoring entry %s\n", filename.c_str());
-		}
-		entry.close();
-	}
-	dir.close();
-	result.sort();
-
-	return result;
+bool Player::play(Playlist* p) {
+	_current_playlist = p;
+	return play();
 }
 
-bool Player::play_album(String album) {
-	//if (_state==playing) stop();
-	album_state s = _last_tracks[album.c_str()];
-	DEBUG("Last index for album %s was %d,%d\n", album.c_str(), s.index, s.position);
-	return play_song(album, s.index, s.position);
-}
-
-bool Player::play_song(String album, uint8_t index, uint32_t skip_to) {
+bool Player::play() {
+	if (_state == sleeping || _state == recording) _wakeup();
 	if (_state != idle) return false;
-	DEBUG("Trying to play song at index %d, offset %d of album %s\n", index, skip_to, album.c_str());
-	String path = _find_album_dir(album);
-	if (path.length()==0) {
-		ERROR("Could not find album.\n");
-		return false;
-	} else {
-		INFO("Found album in dir '%s'.\n", path.c_str());
-	}
-	std::list<String> files = _files_in_dir(path);
-	_playing_album_songs = files.size();
-	DEBUG("Found %d songs in album\n", files.size());
-	if (index >= files.size()) {
-		ERROR("No matching file found - not playing.\n");
-		return false;
-	}
-	//std::list<String>::iterator it = files.begin();
-	//std::advance(it, index);
-	String file = *(std::next(files.begin(), index));
+	if (_current_playlist == NULL) return false;
+	if (_current_playlist->get_file_count()==0) return false;
+	_current_playlist->start();
+	String file = _current_playlist->get_current_file();
+	uint32_t position = _current_playlist->get_position();
 	_state = playing;
-	_playing_album = album;
-	_playing_index = index;
-	_set_last_track(album.c_str(), index, skip_to);
-	_play_file(file, skip_to);
+	_play_file(file, position);
+	_controller->send_player_status();
 	return true;
 }
 
-void Player::play_system_sound(String filename) {
-	//String file = String("/system/") + filename;
-	String file = filename;
-	if (!SD.exists(file)) {
-		ERROR("File %s does not exist!\n", file.c_str());
-		return;
-	}
-	if (_state == playing) {
-		stop();
-		_state = system_sound_while_playing;
-	} else {
-		_state = system_sound_while_stopped;
-	}
-	_play_file(file, 0);
-}
-
 void Player::_play_file(String file, uint32_t file_offset) {
 	INFO("play_file('%s', %d)\n", file.c_str(), file_offset);
-	_file = SD.open(file);
-	if (!_file) return;
+	_spi->select_sd();
+	if (file.startsWith("/")) {
+		_file = new SDDataSource(file);
+	} else if (file.startsWith("http")) {
+		_file = new HTTPSDataSource(file);
+	} else {
+		return;
+	}
+	_file_size = _file->size();
+	_spi->select_sd(false);
+	if (!_file || !_file->usable()) {
+		DEBUG("Could not open file %s", file.c_str());
+		return;
+	}
 
 	DEBUG("Resetting SCI_DECODE_TIME...\n");
 	_write_control_register(SCI_DECODE_TIME, 0);
@@ -334,48 +566,29 @@ void Player::_play_file(String file, uint32_t file_offset) {
 	_write_control_register(SCI_STATUS, _read_control_register(SCI_STATUS) & ~SS_DO_NOT_JUMP);
 	delay(100);
 
+	_spi->select_sd();
 	if (file_offset == 0) {
-		_file.seek(_id3_tag_offset(_file));
+		_file->skip_id3_tag();
 	}
 	_refills = 0;
-	_current_play_position = _file.position();
+	_current_play_position = _file->position();
+	_spi->select_sd(false);
 	_skip_to = file_offset;
 	if (_skip_to>0) _mute();
+	else _speaker_on();
 	INFO("Now playing.\n");
-}
-
-uint32_t Player::_id3_tag_offset(File f) {
-	uint32_t original_position = f.position();
-	uint32_t offset = 0;
-	if (f.read()=='I' && f.read()=='D' && f.read()=='3') {
-		DEBUG("ID3 tag found\n");
-		// Skip ID3 tag version
-		f.read(); f.read();
-		byte tags = f.read();
-		bool footer_present = tags & 0x10;
-		DEBUG("ID3 footer found: %d\n", footer_present);
-		for (byte i=0; i<4; i++) {
-			offset <<= 7;
-			offset |= (0x7F & f.read());
-		}
-		offset += 10;
-		if (footer_present) offset += 10;
-		DEBUG("ID3 tag length is %d bytes.\n", offset);
-	} else {
-		DEBUG("No ID3 tag found\n");
-	}
-	f.seek(original_position);
-	return offset;
+	_controller->send_player_status();
 }
 
 void Player::_flush(uint count, int8_t byte) {
-	SPIMaster::enable(XDCS);
+	_spi->select_vs1053_xdcs();
 	SPI.beginTransaction(*_spi_settings);
 	for(uint i=0; i<count; i++) {
 		_wait();
 		SPI.transfer(byte);
 	}
 	SPI.endTransaction();
+	_spi->select_vs1053_xdcs(false);
 }
 
 void Player::_finish_playing() {
@@ -390,15 +603,14 @@ void Player::_finish_playing() {
 	// If we reached this, the Chip didn't stop. That should not happen.
 	// (That's written in the manual.)
 	// Reset the chip.
-	_init();
+	init();
 }
 
-void Player::stop() {
-	if (_state != playing /* && _state != system_sound_while_playing && _state != system_sound_while_stopped*/) return;
+void Player::stop(bool turn_speaker_off) {
+	if (_state != playing) return;
 	INFO("Stopping...\n");
-	if (_state == playing) {
-		_set_last_track(_playing_album.c_str(), _playing_index, (uint32_t)_file.position());
-	}
+	_current_playlist->set_position(_current_play_position);
+
 	_state = stopping;
 	_stop_delay = 0;
 	_write_control_register(SCI_MODE, _read_control_register(SCI_MODE) | SM_CANCEL);
@@ -408,7 +620,7 @@ void Player::stop() {
 		uint16_t mode = _read_control_register(SCI_MODE);
 		if ((mode & SM_CANCEL) == 0) {
 			_flush(2052, endbyte);
-			_finish_stopping();
+			_finish_stopping(turn_speaker_off);
 			break;
 		} else if (_stop_delay > 2048) {
 			init();
@@ -418,51 +630,57 @@ void Player::stop() {
 	}
 }
 
-void Player::_finish_stopping() {
+void Player::_finish_stopping(bool turn_speaker_off) {
+	if (turn_speaker_off) _speaker_off();
 	_state = idle;
+	_stopped_at = millis();
 	if (_file) {
-		_file.close();
+		_file->close();
+		delete _file;
 	}
+	_current_play_position = 0;
+	_file_size = 0;
 	INFO("Stopped.\n");
+	_controller->send_player_status();
 }
 
 void Player::_refill() {
-	SPIMaster::enable(PIN_SD_CS);
+	_spi->select_sd();
 	_refills++;
 	if (_refills % 1000 == 0) DEBUG(".");
-	uint8_t result = _file.read(_buffer, sizeof(_buffer));
+	uint8_t result = _file->read(_buffer, sizeof(_buffer));
+	_spi->select_sd(false);
 	if (result == 0) {
 		// File is over.
 		DEBUG("EOF reached.\n");
+		_skip_to = 0;
 		_finish_playing();
-		if (_state == system_sound_while_playing) {
-			_finish_stopping();
-			play_album(_playing_album);
-			return;
-		} else if (_state == system_sound_while_stopped) {
-			_finish_stopping();
-			return;
-		}
-
-		_finish_stopping();
-		bool result = play_song(_playing_album, _playing_index + 1);
-		if (!result) {
-			_set_last_track(_playing_album.c_str(), 0, 0);
+		_finish_stopping(false);
+		if (_current_playlist->has_track_next()) {
+			_current_playlist->track_next();
+			play();
+		} else {
+			_current_playlist->reset();
+			_controller->send_player_status();
 		}
+		
 		return;
 	}
 	_current_play_position+=result;
 	_write_data(_buffer);
 
 	if (_skip_to > 0) {
-		if (_skip_to > _file.position()) {
+		if (_skip_to > _file->position()) {
 			uint16_t status = _read_control_register(SCI_STATUS);
 			if ((status & SS_DO_NOT_JUMP) == 0) {
 				DEBUG("Skipping to %d.\n", _skip_to);
 				_flush(2048, _get_endbyte());
-				_file.seek(_skip_to);
+				_spi->select_sd();
+				_file->seek(_skip_to);
+				_spi->select_sd(false);
 				_skip_to = 0;
 				_unmute();
+				_controller->send_position();
 			}
 		} else {
 			_skip_to = 0;
@@ -472,21 +690,61 @@ void Player::_refill() {
 }
 
 bool Player::_refill_needed() {
-	return _state==playing ||
-		_state==stopping ||
-		_state==system_sound_while_playing ||
-		_state==system_sound_while_stopped;
+	return _state==playing || _state==stopping;
 }
 
 bool Player::loop() {
-	if (digitalRead(DREQ) && _refill_needed()) {
+	if (PIN_VS1053_DREQ() && _refill_needed()) {
 		_refill();
 		return true;
 	}
+	
+	if (_state == recording) {
+		DEBUG("r");
+		uint16_t samples_available = _read_control_register(SCI_HDAT1, false);
+		uint16_t vu_value = _read_control_register(SCI_AICTRL0, false);
+		DEBUG("Samples available: %4d, VU meter: 0x%04X\n", samples_available, vu_value);
+		if (samples_available >= 500) {
+			unsigned long sum = 0;
+			for (int i=0; i<500; i++) {
+				uint16_t sample = _read_control_register(SCI_HDAT0, false);
+				sum += sample * sample;
+			}
+			double result = sqrt(sum / 500);
+			DEBUG("Loudness: %f", result);
+		}
+	}
+
+	if (_state == idle && _stopped_at < millis() - VS1053_SLEEP_DELAY) {
+		_sleep();
+		//_record();
+	}
 	return false;
 }
 
-void Player::_set_last_track(const char* album, uint8_t index, uint32_t position) {
-	DEBUG("Setting _last_track[%s]=%d,%d.\n", album, index, position);
-	_last_tracks[album] = {index, position};
+String Player::json() {
+	DynamicJsonDocument json(10240);
+	json["_type"] = "player";
+	json["playing"] = is_playing();
+	if (_current_playlist) {
+		JsonObject playlist = json.createNestedObject("playlist");
+		_current_playlist->json(playlist);
+	} else {
+		json["playlist"] = nullptr;
+	}
+	JsonObject volume = json.createNestedObject("volume");
+	volume["current"] = _volume;
+	volume["min"] = VOLUME_MIN;
+	volume["max"] = VOLUME_MAX;
+	volume["step"] = VOLUME_STEP;
+	return json.as<String>();
+}
+
+String Player::position_json() {
+	if (!is_playing()) return "null";
+	DynamicJsonDocument json(200);
+	json["_type"] = "position";
+	json["position"] = _current_play_position;
+	json["file_size"] = _file_size;
+	return json.as<String>();
 }

src/playlist.cpp

@@ -0,0 +1,347 @@
+#include <playlist.h>
+#include "spi_master.h"
+#include "config.h"
+#include <SD.h>
+#include <algorithm>
+#include <ArduinoJson.h>
+#include <TinyXML.h>
+
+Playlist::Playlist(String path) {
+	if (path.startsWith("/")) {
+		_add_path(path);
+	} else if (path.startsWith("http")) {
+		_examine_http_url(path);
+	}
+	if (_title.length()==0) _title=path;
+}
+
+void Playlist::_add_path(String path) {
+	SPIMaster::select_sd();
+	TRACE("Examining folder %s...\n", path.c_str());
+	if (!path.startsWith("/")) path = String("/") + path;
+	if (!SD.exists(path)) {
+		DEBUG("Could not open path '%s'.\n", path.c_str());
+		SPIMaster::select_sd(false);
+		return;
+	}
+	_title = path.substring(1);
+	int idx = _title.indexOf('/');
+	if (idx>0) {
+		_title.remove(idx);
+	}
+	File dir = SD.open(path);
+	File entry;
+	while (entry = dir.openNextFile()) {
+		String filename = entry.name();
+		filename = filename.substring(path.length() + 1);
+		String ext = filename.substring(filename.length() - 4);
+		if (!entry.isDirectory() &&
+			!filename.startsWith(".") &&
+			( ext.equals(".mp3") ||
+			  ext.equals(".ogg") ||
+			  ext.equals(".wma") ||
+			  ext.equals(".mp4") ||
+			  ext.equals(".mpa"))) {
+			TRACE("    Adding entry %s\n", entry.name());
+			String title = filename.substring(0, filename.length() - 4);
+			_files.push_back({.filename=entry.name(), .title=title});
+			bool non_ascii_chars = false;
+			for(int i=0; i<filename.length(); i++) {
+				char c = filename.charAt(i);
+				if (c < 0x20 || c >= 0x7F) {
+					non_ascii_chars = true;
+					break;
+				}
+			}
+			if (non_ascii_chars) {
+				ERROR("WARNING: File '%s' contains non-ascii chars!\n", filename.c_str());
+			}
+		} else {
+			TRACE("  Ignoring entry %s\n", filename.c_str());
+		}
+		entry.close();
+	}
+	dir.close();
+	SPIMaster::select_sd(false);
+	std::sort(_files.begin(), _files.end());
+}
+
+void Playlist::_examine_http_url(String url) {
+	HTTPClientWrapper* http = new HTTPClientWrapper();
+	if (!http->get(url)) {
+		DEBUG("Could not GET %s.\n", url.c_str());
+		return;
+	}
+	String ct = http->getContentType();
+	DEBUG("Content-Type is %s.\n", ct.c_str());
+	if (ct.startsWith("audio/x-mpegurl")) {
+		_parse_m3u(http);
+	} else if (ct.startsWith("audio/")) {
+		_files.push_back({.filename=url, .title=url});
+	} else if (ct.startsWith("application/rss+xml")) {
+		_parse_rss(http);
+	} else if (ct.startsWith("application/pls+xml")) {
+		_parse_pls(http);
+	} else {
+		ERROR("Unknown content type %s.\n", ct.c_str());
+	}
+	http->close();
+	delete http;
+}
+
+std::vector<PlaylistEntry>* xml_files_ptr = NULL;
+String xml_last_tag = "";
+String xml_title = "";
+String xml_album_title = "";
+String xml_url = "";
+String xml_enclosure_url = "";
+bool xml_enclosure_is_audio = false;
+
+void xmlcb(uint8_t status, char* tagName, uint16_t tagLen, char* data, uint16_t dataLen) {
+	String tag(tagName);
+	if (status & STATUS_START_TAG) xml_last_tag = tag;
+
+	if (tag.equals("/rss/channel/title") && (status & STATUS_TAG_TEXT)) {
+		xml_album_title = data;
+	} else if (tag.endsWith("/item") && (status & STATUS_START_TAG)) {
+		xml_title = "";
+		xml_url = "";
+	} else if (tag.endsWith("/item/title") && (status & STATUS_TAG_TEXT)) {
+		xml_title = String(data);
+	//} else if (xml_last_tag.endsWith("/item/enclosure") && (status & STATUS_ATTR_TEXT)) {
+	//	DEBUG("tag: %s, data: %s\n", tag.c_str(), data);
+	} else if (xml_last_tag.endsWith("/item/enclosure") && tag.equals("type") && (status & STATUS_ATTR_TEXT) && String(data).indexOf("audio/")>=0) {
+		DEBUG("enclosure is audio\n");
+		xml_enclosure_is_audio = true;
+	} else if (xml_last_tag.endsWith("/item/enclosure") && tag.equals("url") && (status & STATUS_ATTR_TEXT)) {
+		DEBUG("found url\n");
+		xml_enclosure_url = String(data);
+	} else if (tag.endsWith("/item/enclosure") && (status & STATUS_END_TAG)) {
+		DEBUG("end of enclosure. xml_enclosure_is_audio: %d, xml_enclosure_url: %s\n", xml_enclosure_is_audio, xml_enclosure_url.c_str());
+		if (xml_enclosure_is_audio && xml_enclosure_url.length()>0) {
+			xml_url = xml_enclosure_url;
+		}
+		xml_enclosure_is_audio = false;
+		xml_enclosure_url = "";
+	} else if (tag.endsWith("/item") && (status & STATUS_END_TAG)) {
+		if (xml_title.length()>0 && xml_url.length()>0) {
+			DEBUG("Adding playlist entry: '%s' => '%s'\n", xml_title.c_str(), xml_url.c_str());
+			xml_files_ptr->push_back({xml_url, xml_title});
+		}
+	}
+}
+
+void Playlist::_parse_rss(HTTPClientWrapper* http) {
+	DEBUG("RSS parser running.\n");
+	// http is already initialized
+	int i;
+	
+	TinyXML xml;
+	uint8_t* buffer = new uint8_t[150];
+	xml.init(buffer, 150, &xmlcb);
+	xml_files_ptr = &_files;
+	xml_title = "";
+	xml_album_title = "";
+	xml_url = "";
+	xml_enclosure_is_audio = false;
+	xml_enclosure_url = "";
+	while ((i = http->read()) >= 0) {
+		xml.processChar(i);
+	}
+	xml_files_ptr = NULL;
+	if (xml_album_title.length()>0) {
+		_title = xml_album_title;
+	}
+	xml_album_title = "";
+	delete buffer;		
+	// don't close http at the end
+	DEBUG("RSS parser finished.\n");
+}
+
+void Playlist::_parse_m3u(HTTPClientWrapper* http) {
+	// http is already initialized
+	String line = "";
+	String title = "";
+	int i;
+	do {
+		i = http->read();
+		char c = i;
+		if (i>=-1 && c!='\r' && c!='\n') {
+			line += c;
+		} else {
+			if (line.equals("#EXTM3U")) {
+				// Do nothing
+			} else if (line.startsWith("#EXTINF")) {
+				int idx = line.indexOf(",");
+				if (idx>4) {
+					// Get the title
+					title = line.substring(idx+1);
+					if (_title.length()==0) _title=title;
+				}
+			} else if (line.startsWith("http")) {
+				if (title.length()==0) title = line;
+				_files.push_back({.filename=line, .title=title});
+				title = "";
+			}
+			line = "";
+		}
+	} while (i>=0);
+	// don't close http at the end
+}
+
+void Playlist::_parse_pls(HTTPClientWrapper* http) {
+	// http is already initialized
+	String line;
+	String title = "";
+	String url = "";
+	int last_index = -1;
+	int index;
+
+	while(true) {
+		line = http->readLine();
+		if (line.startsWith("Title")) {
+			uint8_t eq_idx = line.indexOf('=');
+			if (eq_idx==-1) continue;
+
+			index = line.substring(5, eq_idx-4).toInt();
+			title = line.substring(eq_idx+1);
+			if (index != last_index) {
+				url = "";
+				last_index = index;
+			}
+		} else if (line.startsWith("File")) {
+			uint8_t eq_idx = line.indexOf('=');
+			if (eq_idx==-1) continue;
+
+			index = line.substring(5, eq_idx-4).toInt();
+			url = line.substring(eq_idx+1);
+			if (index != last_index) {
+				title = "";
+				last_index = index;
+			}
+		}
+
+		if (title.length()>0 && url.length()>0) {
+			_files.push_back({.filename=url, .title=title});
+			last_index = -1;
+			title = "";
+			url = "";
+		}
+	}
+	// don't close http at the end
+}
+
+uint16_t Playlist::get_file_count() {
+	return _files.size();
+}
+
+void Playlist::start() {
+	_started = true;
+}
+
+bool Playlist::has_track_prev() {
+	return _current_track > 0;
+}
+
+bool Playlist::has_track_next() {
+	return _current_track < _files.size()-1;
+}
+
+bool Playlist::track_prev() {
+	if (_current_track > 0) {
+		_current_track--;
+		_position = 0;
+		return true;
+	}
+	return false;
+}
+
+bool Playlist::track_next() {
+	if (_current_track < _files.size()-1) {
+		_current_track++;
+		_position = 0;
+		return true;
+	}
+	return false;
+}
+
+bool Playlist::set_track(uint8_t track) {
+	if (track < _files.size()) {
+		_current_track = track;
+		_position = 0;
+		return true;
+	}
+	return false;
+}
+
+void Playlist::track_restart() {
+	_position = 0;
+}
+
+void Playlist::shuffle(uint8_t random_offset) {
+	DEBUG("Shuffling the playlist with an offset of %d...\n", random_offset);
+	for (int i=random_offset; i<_files.size(); i++) {
+		int j = random(random_offset, _files.size()-1);
+		if (i!=j) {
+			TRACE("  Swapping elements %d and %d.\n", i, j);
+			PlaylistEntry temp = _files[i];
+			_files[i] = _files[j];
+			_files[j] = temp;
+		}
+	}
+	_shuffled = true;
+	TRACE("Done.\n");
+}
+
+void Playlist::advent_shuffle(uint8_t day) {
+	if (day > 24) day = 24;
+	
+	if (day > _files.size()) return;
+	
+	_files.insert(_files.begin(), _files[day - 1]);
+	_files.erase(_files.begin() + day - 1, _files.end());
+}
+
+void Playlist::reset() {
+	std::sort(_files.begin(), _files.end());
+	_current_track = 0;
+	_position = 0;
+	_shuffled = false;
+	_started = false;
+}
+
+String Playlist::get_current_file() {
+	return _files[_current_track].filename;
+}
+
+uint32_t Playlist::get_position() {
+	return _position;
+}
+
+void Playlist::set_position(uint32_t p) {
+	_position = p;
+}
+
+bool Playlist::is_fresh() {
+	return !_shuffled && !_started && _position==0 && _current_track==0;
+}
+
+void Playlist::dump() {
+	for (int i=0; i<_files.size(); i++) {
+		DEBUG("  %02d %2s %s\n", i+1, (i==_current_track) ? "->" : "", _files[i].filename.c_str());
+	}
+}
+
+void Playlist::json(JsonObject json) {
+	json["_type"] = "playlist";
+	json["title"] = _title;
+	JsonArray files = json.createNestedArray("files");
+	for (PlaylistEntry entry: _files) {
+		JsonObject o = files.createNestedObject();
+		o["filename"] = entry.filename;
+		o["title"] = entry.title;
+	}
+	json["current_track"] = _current_track;
+	json["has_track_next"] = has_track_next();
+	json["has_track_prev"] = has_track_prev();
+}

src/playlist_manager.cpp

@@ -0,0 +1,166 @@
+#include "playlist_manager.h"
+#include <SD.h>
+#include "spi_master.h"
+#include <ArduinoJson.h>
+
+PlaylistManager::PlaylistManager() {
+	scan_files();
+}
+
+void PlaylistManager::scan_files() {
+	SPIMaster::select_sd();
+	std::vector<String> folders;
+	File root = SD.open("/");
+	File entry;
+	while (entry = root.openNextFile()) {
+		String foldername = entry.name();
+		if (foldername.startsWith("/.")) continue;
+		foldername.remove(foldername.length());
+		folders.push_back(foldername);
+		_check_for_special_chars(foldername);
+		entry.close();
+	}
+
+	_map.clear();
+	if (!SD.exists("/_mapping.txt\n")) {
+		ERROR("WARNING: File /_mapping.txt not found.\n");
+	} else {
+		File f = SD.open("/_mapping.txt");
+		DEBUG("Reading /_mapping.txt...\n");
+		while (f.available()) {
+			char buffer[512];
+			size_t pos = f.readBytesUntil('\n', buffer, 511);
+			buffer[pos] = '\0';
+
+			String data = buffer;
+			uint8_t eq = data.indexOf('=');
+			if (eq>0 && eq<data.length()-1) {
+				String rfid_id = data.substring(0, eq);
+				String folder = data.substring(eq + 1);
+				TRACE("  Adding mapping: %s=>%s\n", rfid_id.c_str(), folder.c_str());
+				_map[rfid_id] = folder;
+				
+				if (folder.charAt(0)=='/') {
+					bool found=false;
+					for (String f: folders) {
+						if (f.equals(folder)) {
+							found = true;
+							break;
+						}
+					}
+					if (!found) {
+						INFO("WARNING: Found mapping for RFID id %s which maps to non-existing folder %s!\n", rfid_id.c_str(), folder.c_str());
+					}
+				}
+			}
+		}
+		f.close();
+	}
+	root.close();
+
+	_unmapped_folders.clear();
+	for (String folder: folders) {
+		bool found = false;
+		for(std::map<String, String>::iterator it = _map.begin(); it != _map.end(); it++) {
+			if (it->second.equals(folder)) {
+				found = true;
+				break;
+			}
+		}
+		if (!found) {
+			// Checking folder for media files
+			File dir = SD.open(folder);
+			while (entry = dir.openNextFile()) {
+				String filename = entry.name();
+				filename = filename.substring(folder.length() + 1);
+				if (!filename.startsWith(".") && filename.endsWith(".mp3")) {
+					found = true;
+				}
+				entry.close();
+				if (found) break;
+			}
+			if (found) {
+				_unmapped_folders.push_back(folder);
+			}
+		}
+	}
+	SPIMaster::select_sd(false);
+}
+
+void PlaylistManager::_check_for_special_chars(String s) {
+	for(int i=0; i<s.length(); i++) {
+		char c = s.charAt(i);
+		if (c < 0x20 || c >= 0x7F) {
+			ERROR("WARNING: Folder / file '%s' contains non-ascii chars!\n", s.c_str());
+			return;
+		}
+	}
+}
+
+Playlist* PlaylistManager::get_playlist_for_id(String id) {
+	if (!_map.count(id)) return NULL;
+	String folder = _map[id];
+	return get_playlist_for_folder(folder);
+}
+
+Playlist* PlaylistManager::get_playlist_for_folder(String folder) {
+	if (!_playlists.count(folder)) {
+		_playlists[folder] = new Playlist(folder);
+	}
+	return _playlists[folder];
+}
+
+void PlaylistManager::dump_ids() {
+	for (std::map<String, String>::iterator it = _map.begin(); it!=_map.end(); it++) {
+		INFO("  %s -> %s\n", it->first.c_str(), it->second.c_str());
+	}
+}
+
+String PlaylistManager::json() {
+	DynamicJsonDocument json(10240);
+	json["_type"] = "playlist_manager";
+	JsonObject folders = json.createNestedObject("folders");
+	for (std::map<String, String>::iterator it = _map.begin(); it!=_map.end(); it++) {
+		folders[it->second] = it->first;
+	}
+	JsonArray started = json.createNestedArray("started");
+	for (std::map<String, Playlist*>::iterator it = _playlists.begin(); it!=_playlists.end(); it++) {
+		if (it->second->is_fresh()) continue;
+		started.add(it->first);
+	}
+	JsonArray unmapped = json.createNestedArray("unmapped");
+	for(String folder : _unmapped_folders) {
+		unmapped.add(folder);
+	}
+	return json.as<String>();
+}
+
+bool PlaylistManager::add_mapping(String id, String folder) {
+	DEBUG("Adding mapping: %s=>%s\n", id.c_str(), folder.c_str());
+	_map[id] = folder;
+	_save_mapping();
+	return true;
+}
+
+void PlaylistManager::_save_mapping() {
+	SPIMaster::select_sd();
+	File f = SD.open("/_mapping.txt", "w");
+	String s = create_mapping_txt();
+	unsigned char* buf = new unsigned char[s.length()];
+	s.getBytes(buf, s.length());
+	f.write(buf, s.length()-1);
+	f.close();
+	SPIMaster::select_sd(false);
+	delete buf;
+}
+
+String PlaylistManager::create_mapping_txt() {
+	String s;
+	for(std::map<String, String>::iterator it = _map.begin(); it != _map.end(); it++) {
+		s += it->first;
+		s += "=";
+		s += it->second;
+		s += '\n';
+	}
+	return s;
+}